TWI227884B - Optical pick-up apparatus, optical disc apparatus, optical apparatus and compound optical device - Google Patents

Abstract

The present invention is related to optical pick-up apparatus for regenerating the optical disc record and is provided with the followings: the first diffracting optical grating (45) for dividing light emitted from the integrated emitting/receiving device (31) into the zero order light and ± first order light; the second diffracting optical grating (46), which diffracts the optical path of the light reflected from the optical disc (2); and the third diffracting optical grating (47), which is disposed at the position where the + first order light diffracted through the second diffracting optical grating is incident so as to diffract the + first order light and compensate the optical path variation. The integrated emitting/receiving device is disposed at the position where the - first order light diffracted through the third diffracting optical grating (47) is incident. By receiving the - first order light, a focus error signal FE is obtained. In addition, by receiving the light, which is reflected from the optical disc, of the ± first order light divided by the first diffracting optical grating, the traced error signal is obtained.

Description

1227884 Rose, description of the invention: [Technical field to which the invention belongs] The present invention relates to an optical magnetic disc, a phase-change type ... recording and reproducing optical disc, recording information and a small piece of light = an optical pick-up of bamboo shoots. Beicheng Reproduces the optical disc device prepared with the optical pickup device, and refers to the optical device used in these devices and a composite optical element with a #band optical device. < Establishment of Moon Bean Formation = The application is based on the date of application dated on the 22nd in Japan ^ 22 and claims the priority, and the "documents" are incorporated herein by reference. ", This special application for May [prior art] First uranium has a kind of optical disc recording for optical magnetic discs, phase-change 氺 氺, and dusting discs: # 讯 和 进行Recorded optical pickup device. This optical pickup device for reproduction is provided as shown in the figure ^ Youxue system 201. The optical system 201 shown in FIG. 1 is provided in the order of optical path. The composite optical element 2 11 is a wide-area light emitting unit, and has a wavelength of 12, which has a function of dividing the light emitted from the light source 2 11 into three parts and separating the emitted light and returning it from the optical disc 204; The beam-splitting light-receiving grating ㈣, which opens the thumb light, has a π aperture 214, which is used to focus the outgoing light: special: numerical aperture NA; for the objective lens 215, which is ^. Τ A 印Focused on the disc 204 first; and Wenguang 4216 'It received the light from the disc 204, and the light source 211 A semiconductor laser is used to emit the laser, °, and ·. The composite optical element 212 is an optical element for forming a three-beam diffraction grating 2 1 2 a diffraction grating for blood eight-knife beam device 1227884 212b. Three-beam diffraction [2 A ^ PLUS & three-beam method to obtain phase error #, # = Grid 2124 seeks from the so-called division into three times including 0th order light and ± 1st order, original, 21 = out of The emitted light 212b is made to emit from the optical disc 204. The beam is guided by a diffraction grating such as the secondary light; Γ becomes 0th light and earth 1st light. It is separated from the emitted light. So II 6 has: a photodetector for receiving the reflected light by the three-beam diffraction light sensation 2a / secondary light; and a separate detector that receives the returned light to make the material shine on the thumb The side beams of one group of ± 1 order light are measured with bismuth first, but it is not shown in the figure. The optical subsystem 201 uses the so-called astigmatism method as a financial detection method for detecting focus error signals. As shown in Figure 2A and Figure 2 As shown in FIG. 2B and FIG. 2C, the light receiving surface of the main beam using the light detection state 221 after the incineration and returning light forms a roughly square shape, and is formed to be passed through the light receiving surface. A group of dividing lines that are orthogonal to each other is divided into four equally divided light receiving areas a5, b5, C5, and d5. In addition, the side-beam photodetectors are arranged on the main-beam photodetectors 221, respectively. It ’s in a relative position, but it is not shown in the figure. As shown in Figure i, the optical system 201 uses the light emitting point of the light source 2 11 as the object point during the journey from the light source 211 to the optical disc 204. The optical points of the conjugate point are arranged on the recording surface 205 of the optical disc 204. The optical system 201 arranges the optical disc 204 on the return path from the optical disc 204 to the light receiving portion 216. 2 The point above 0.5 is the object point, and each optical component is arranged such that the image point of its conjugate point is set on the light receiving surface of the main beam photodetector 221 of the light receiving section 216. Therefore, the light emitting point of the light source 2 11 of the 'optical system 20 1 and the main 1227884 beam of the light receiving portion 2 1 6 are related. Detecting points on the light-receiving surface of the light 2 2 1 with light also forms a good relationship with each other. The following description uses the above-mentioned main light-receiving area photodetector 221 for each light-receiving area center 'h, & to obtain the focus error signal. method. First, the objective lens 21 5 forms an optimal position on the recording surface 205 of the optical disc 204 and forms a focus on the light-receiving surface of the so-called correctly focused bear T main beam photodetector 22 1 which focuses on the recording surface 205 of the optical disc 204. The beam spot shape is circular as shown in FIG. However, when the objective lens 2 丨 5 is too close to the recording surface 205 of the optical disc 2 04, it will deviate from the correct focus state, because the radiation separated by the diffraction grating 212 b by the beam splitter = light is generated by the composite optical element 212 The astigmatism leads to the shape of the beam spot of the main beam photodetector 221 on the light receiving surface as shown in FIG. 2a. The topography has an elliptical shape with the growth axis spanning the light receiving area as and the light receiving area C5. In addition, when the objective lens 21 5 is too far away from the recording surface 205 of the optical disc 204, it also deviates from the positive $ to cause a focal evil, because the returned light separated by the 21 beam of the diffraction grating by the beam splitter = passes through the composite optical element 212. The resulting astigmatism causes the main beam to be detected by light 22. The shape of the beam spot on the light surface is shown in Figure π. The topographic growth axis spans the light receiving area b5 and the light receiving area W ellipse, and is different from the above figure Comparison of the shape of the beam spot 'The photodetector 22 1 for forming an elliptical main beam inclined at a major axis direction of only 90 degrees at each return light is Sa5, Sb5, and the light receiving area a5 is calculated as shown in the following formula 1. b5, c5, d5 shot Sc! 'Sds, focus error signal 叩

FE = (Sa5 + Sc5). (Sb5 + Sd5) 1227884 Also shown in Fig. 2B, when the main beam photodetector 22 i is in the so-called correct focus state at the focus position, the above formula is used to calculate The focus error signal FE is zero. In addition, when the main beam photodetector 221 is too close to the recording surface 205 of the optical disc 204 on the objective lens 215, the focus error signal FE is positive, and the objective lens W is away from the recording surface 205 of the optical disc 204. When it is too far away, the $ focus error signal is negative. The tracking error signal TE is divided by the light beam detector for the side beam and divided by the two-beam diffraction grating 212a. The secondary light is used to calculate the output of the light detector for each side beam. Difference. An optical pickup device having the above-structured optical system 201 is based on the focus error signal FE obtained by the main beam photodetector 221 of the light receiving section 216 and the side beam photodetector. The tracking error signal π 'is driven by displacing the objective lens 215'. The objective lens 2ΐ5 and the recording surface 205 of the optical disc 205 are moved to the focusing position, and the emitted light is focused on the recording surface 205 of the optical disc 204. The information is reproduced from the optical disc 2004. • Those who, in general, semiconductor lasers such as the light source 211 have the property that the wavelength of the laser light is related to the ambient temperature. When the ambient temperature is D, the vibration i wavelength of the laser light of the semiconductor laser at temperature τ is the D wavelength, and the oscillation wavelength at room temperature is human. 当当, 西 如 挂. When the temperature of the crossing is ΔT and the temperature coefficient is c, it can be approximated by the following formula 2. • · · · (2) λΤ = λΟ + ο · ΔΤ In addition, the laser light is incident on the above-mentioned diffraction grating for the beam splitter, such as 2m, and is diffracted by Nichiji. , The relationship between the incident angle ㊀ and the diffraction angle θ ′ of 1227884 can be expressed by the following formula 3. η1 · sin6, -n · sin0 = m · λ / d .... (3) In addition, λ is the wavelength of the laser light, d is the grating constant of the diffraction grating, the number of diffractions is η, and η is the medium on the incident side. The refractive index, n, is the refractive index of the exit-side medium. . In the above-mentioned optical system 201, the light diffracted by the diffraction grating 2 12 b of the beam splitter of the composite optical element 212 is diffracted because the main beam system is n 2; [, ㊀ = 〇, and thus diffracted. When the order is + 1, the formula 3 can be rewritten as the following formula 4. _ η1 · sin0f = X / d · · · · (4) From the above formula 2 to formula 4, in the case where the ambient temperature set by the optical system 20 is changed, the diffraction angle of the temperature T is θ, τ, Equation 2 can be substituted into Equation 4 to obtain Equation 5 below. η '· sin0'T = 〇O + c · AT) / d · · · · (5) Furthermore, the diffraction angle at room temperature is θ, 〇, using the diffraction angle θ, 〇 can be obtained from Equation 5 _ The following formula 6. η '· sine' T = n, · sine 'O + c · ΔΤ / d · · · · (6) From Equation 6, the diffraction angle θ, τ at temperature T can be expressed by Equation 7 below. e'T ^ e'O + sin-kCc · AT) / (d · η,)) · · · · (7) As can be seen from Equation 7, the diffraction angles θ, τ, and Δτ at the temperature τ of the returned light It is related to the change of the ambient temperature of the optical system 201. -10-1227884 Secondly, in the optical pickup device, since the manufacturing steps are performed at normal temperature, the position of the light receiving section 216 is adjusted so that the diffraction angle of the returned light is θ, 0. However, after the position of the light receiving unit 216 is adjusted, when the ambient temperature changes, the diffraction angle of the reflected light changes as shown in Equation 7. As shown in FIG. 3, the main beam light for the light receiving unit 2 1 6 is irradiated. The center of the beam spot on the light receiving surface of the detector 22 1 is shifted from a specific position. When the optical system 2101 provided in the optical pickup device obtains the focus error signal FE through the light receiving 4 2 1 6 described above, the central beam is irradiated autonomously at the center of the beam spot on the light receiving surface of the main beam photodetector 221. The center of the photodetector 221 is deflected by at least # 'in any direction so that the output in the correct state is not 0', so the focus error signal FE is biased. As described above, since the optical pickup device performs focus control 'so that the focus error signal FE is 0, there is a problem that the objective lens 215 cannot be driven and controlled to the correct focus position. As described above, the astigmatism generated by the optical block that allows light to pass through π to 卞 导致 makes it impossible to properly focus the returned light on the user's position: the light for the main beam irradiated to the light receiving section 216 The shape of the beam spot on the front surface of the detector 22⑴ is shifted from a suitable roughly circular shape. '== There are also optical pickup devices that cannot properly generate focus error signals. I SUMMARY OF THE INVENTION The purpose of the present invention is to provide an optical pickup device that can shoot back from the optical disc to improve the reliability of the focus error signal, Optics in these devices, as well as pre-arranged and integrated optical elements. 1227884 :: Other purpose of Ming is to provide an optical device and beam = suppress the distortion of 1 beam = caused by the astigmatism of the optical system receiving the light returned from the disc 'optical = optical object to improve the reliability of the focus error signal, and for The optical device of these devices and the composite Γ: The hair-study pick-up device has: a light source that emits a specific wavelength: two and condenses the light returned from the optical disc; the composite optical element = the self- and I-stone element, Is it to transmit the light emitted from the light source, and to shoot through the plant? : Diffraction of light; and optical path variation correction mechanism, which is configured to emit the second: the position where the incident light returns to the incident light, and corrects the incident light from the diffraction element caused by the wavelength change of the light source wt and the emitted light = To direct the returned light to a specific position; and the light receiving mechanism is to receive the returned light after the light path change correction mechanism corrects the light path change in the f light receiving areas. The optical pick-up device constructed as above is also focused on the optical disc by the objective lens and diffracts the light emitted from the wind disc by the diffractive element in the composite optical element. Light path separation. Then, the light-fetching device corrects the optical path change of the returning light generated by the diffracting element due to the wavelength change of the light emitted from the light source through the optical path change correction mechanism, = the return light is guided to a specific position of the light receiving mechanism ' Then, a proper focus error signal is obtained by the light receiving mechanism in the number α and the light area to receive the reflected light directed to a specific position. The other optical pickup device of the present invention includes: a light source, which emits light of a specific wavelength of -12 to 1227884; a reflection of the reflected light from the light beam and the optical disc emitted from the light source; The astigmatism is corrected in the optical path and: two: the light emitted from the light source is condensed on the optical disc, and the light = 2: the returning light is condensed; the light division mechanism, which is equipped with several; and two tr: the position where the light is incident, and the number of points divided by the returning light is divided into the number of light-receiving areas received by the light-splitting plane :: the returning light; the optical pickup device system of the light division mechanism By emitting two light from the light source = disc, the light returned from the optical disc is separated by the beam splitter on the basis of the correction. The astigmatism amount of the returned light is appropriately corrected, and the input and the light are divided. The beam shape of the returning light from the mechanism. ° Recording = loading = = learning pickup device, which records the disc. And ... and weaving drive mechanism, which is a rotation drive light pair device has: light source 'It emits light of a specific wavelength itiUf, The light emitted from the light source is condensed on the optical disc, and there are ::--The light returned by the light is condensed; a composite optical element, which is equipped with a monument; 1 cow, which makes the light emitted from the light source emitted It is transparent, and enables the diffracting of the self-diffractive element and the optical path variation correction mechanism, which is arranged at the position where the emitted light :: Ϊ returns to the position where the light is incident, and corrects the diffraction caused by the emission from the light source. The light path of the returning light generated by the element has changed to a light: the mouth light ¥ is directed to a specific position; and the light receiving mechanism is connected to several; the field accepts the light return after the light path change correction mechanism corrects the light path change 1227884 as above The optical disc device is formed by tying the disc, and the optical pickup device is used to drive the optical disc device to drive the optical disc device. The optical pickup device borrows two: = then the light is focused on the optical disc, and borrows the optical power of ... The pick-up device is separated by light. Later, the optical disc was installed. The Xixianshan first corrected the light generated by the diffractive element due to the wavelength variation of the light emitted from the light source. The cross motion 'directs the returned light to a specific position of the light receiving mechanism, and constitutes a plurality of light receiving areas to receive the radiation directed to a specific position = and = a mechanically-focused focus error signal. The ejection opening first obtains other optical disc devices suitable for the present invention and the disc recording and / or reproduction information, and the fetch set, which is for the optical moving disc; and the optical pickup device has a rotation drive mechanism, which is a rotary drive. The light emitted by the shooting light Γ: The light emitted by the light source and the object lens passing through the optical disc will correct the astigmatism from each of the first mountains; and the light will be scattered and broken o ': the light is focused on the optical disc The beam is divided by the beam splitter. The first division mechanism is arranged at the position where the return light from the mouth-to-mouth knife is incident, and the light receiving mechanism. J: It is divided into several, "" The eight returning beams of light. The eight domains of light receive the beams formed by the light segmentation mechanism. The pre-curved phase structure appropriately corrects the returning beams of light by using different planes or curved surfaces with different light paths. Place the moxibustion image, adjust the incidence -14-1227884 to the light division mechanism. The optical device used for the above optical pickup device is equipped with a winding system that transmits the light emitted from the light source, and makes the projection element, and the optical path; Change correction mechanism, which is arranged in the warp bowl: the reflected light is diffracted and reflected back The position of the light is corrected due to the light emitted from the light source: / The wavelength of the light emitted by the diffractive element caused by the diffraction of the diffraction element is changed to a specific position. The light is guided back to the optical device and will be emitted from the light source. The outgoing light guide + element diffracts the light returned from the optical disc and the emitted light is diffracted by the diffraction by the optical path change correction mechanism to correct the light emitted from the light source = off 'and borrow = the diffraction element. Process change ::: = At the appropriate position of the light receiving mechanism of the domain. Another optical device of the present invention is provided with the beam emitted by the beam splitter. The optical path of the reflected light from the dish, and the astigmatism of the reflected light king1, and the light division mechanism, straightly weeping and dividing the miscellaneous gate, 丨 > Eight you are arranged in the beam to be divided into several "I : At the incident position, the light-receiving mechanism that divides the returned light into a plurality of light-guiding areas is guided. The light-splitting mechanism is composed of several planes or curved surfaces. The light of I to I is directed to the disc by directing the emitted light from the light source to the fruit by beam splitting-separating the light returned from the previous disc to be different from the emitted light. Ground correction of the astigmatism of the returned light 'adjusts the beam shape of the returned light incident on the light component ° J deconstruction. In addition, the composite optical element of the present invention includes: a diffractive element that transmits -15-! 227884 light emitted from a light source, and diffracts light returned from the optical disc; It is arranged at the return of the diffraction by the diffractive element: the position of the incident, correcting the change of the optical path of the returning light generated by the Diffraction diffractive element due to the change of the wavelength of the light emitted from the light source, and returning the light to the position of the light . The composite optical element of the present invention constructed as described above guides the light emitted from the light source ^ toward the optical disc, and the light emitted from the optical disc is diffracted by the diffractive element to be separated from the light% by the diffraction element, and the optical path variation correction mechanism is used. Correcting the light path change of the reflected light generated by the diffractive element due to the wavelength change of the emitted light from the light source, and directing the returned light to the light receiving areas having several light receiving areas for obtaining the focusing error signal of the optical pickup device The proper position of the mechanism. ▲ The other purpose of this 'X Ming' and the benefits obtained by the present invention will be further understood from the following description of the embodiments described with reference to the drawings. [Embodiment] Hereinafter, an optical disc device to which the present invention is applied will be described with reference to the drawings. The arrangement of the optical disc of the present invention shown in FIG. 4 is for CD-R (Recordable), such as CD (Compact Disc), DVD (Diversified Digital Optical Disc), ^ ^} J 5 Reproduction of CD-RW (Kuiyi, Chubu ☆ U Rewrite) of δίΐ was recorded, and two discs, such as the disc in front of the temple, and the magneto-optical disc, were reproduced and recorded. Optical disc device 1 includes: Bai Zhishi 1 ¥ ^ 'Optical pickup device 3 for recording and reproduction of information from the first industry 2; Rotary drive 弁 雄 π # Pre-jumper 2 rotary drive mechanism 4; Optical pickup device 3 to the direction of the optical disc 2 々m universal private transfer mechanism 5; and the control section b which controls these optical pickup devices 3, Dojo #green, rotary drive mechanism 4, and transfer mechanism 5 -1227884 disc rotation drive mechanism 4 has: a disc table 7 on which the disc 2 is mounted; and a spindle motor 8 that rotationally drives the disc table 7. The transport mechanism 5 has a support base supporting the optical pickup device 3; a main shaft and an auxiliary shaft movably supporting the support base; and a lead-through motor for moving the support base, but it is not shown in the figure. As shown in FIG. 4, the control unit 6 includes: an access control circuit 9 for driving and controlling the transport mechanism $, and controlling the position of the optical pickup device 3 in the radial direction of the optical disc 12; The servo circuit of the actuator and the control of the drive controller of the temple access control circuit 9 and the servo circuit 10. The control section 6 includes a signal demodulation circuit # 2 for demodulating and processing the signal of the optical pickup device 3; an error correction circuit 13 for correcting an error of the demodulation processing signal; and outputting the signal after the error correction to an external computer Interfaces for electronic equipment 丨 4. The optical disc device 1 constituted by a taxi is driven by a spindle motor 8 of the optical disc rotation driving mechanism 4 to rotate and drive the optical disc table 7 on which the optical disc 2 is mounted, and drives and controls the transmission mechanism in response to the control signal of the accessing circuit 9 of the control unit 6 5. Move the optical pickup I to 3 to the position corresponding to the required recording path of the optical disc 2, and record and reproduce information on the optical disc 2. Hereinafter, the above-mentioned optical pickup device 3 will be described in detail. As shown in FIG. 5, the dependent island optical pickup device 3 includes: a light for reproducing information from the optical disc 2: a system 30 ′, and the optical system 30 has a feature that is not shown later in the figure for driving and displacing the objective lens. Drive mechanism. · == The optical system 30 possessed by the learning pickup device 3 has the following optical path sequence: light receiving = body size 31, which is integrally formed with the light receiving element, which receives the light source emitting laser light and returns it from the optical disc 2 Light; * combined optical element /, is the light emitted by the knife-brake from the light-receiving integrated element 3 丨, and separates -17-Ϊ227884 from: the light returned by the disc 2 and the emitted light; The output light transmitted through the "complex light emitting integrated element 31" and emitted from the composite optical element 32 is condensed into a specific numerical aperture NA; and the objective lens 34 is used for condensing the output light condensed by the aperture stop 33 on the optical disc. The record side of 2 is on. The light-receiving integrated element 31 includes: a semiconductor laser that emits laser light having a wavelength of about two wavelengths; and a light-receiving element that is divided into a light-receiving region with a detailed inner valley as described later. As shown in FIG. 5 to FIG. 7, the composite optical element 32 is formed into a block shape by injecting a molding resin material, and has the following characteristics: before the light is emitted from the light-emitting body: The first intersection 41 ′ and the second surface a parallel to the first surface 41. The first surface 41 is provided with a first diffraction grating M that divides the emission suppressed by the self-luminous integrated element into three beams including 0th order light and ± 1st order light. The learning system 30 applies the so-called (three-beam method) in order to obtain the tracking error signal TE, and detects by receiving the light-emission-type element 31 by the first-order light divided by the first implant grating 45 ± The difference between the outputs of the primary light; g The second surface 42 is provided with a second diffracted light thumb 46, which is used to diffract 0 times and ± 1 times of light divided by the first diffraction grating 45 in the returning light from the light beam. It is equally divided into 0th order light and ± 1st order light. If the + 1st order light is used as an emission, it is separated from the optical path of the emitted light. In addition, the first surface 41 is provided with a second g, a filling grating 4 7, which is located on the optical path of the reflected light separated by the second diffraction grating 46, so that the reflection is further divided into 0 times. Light and earth primary light, if the small under-light is directed to receive light— -18- 1227884 A diffraction grating 4 5. The composite optical element 32 passes back the light separated by the second diffraction grating chirp to pass through: The return light incident on the third diffraction grating 47 is given only a certain amount of image. Composite optical element # ^ 9 > 32 pieces are shot by the integrated self-receiving light-emitting element 31

The position of the emitted light beam from the direction π can be easily adjusted. The optical disc 2 and the composite optical element 32 are formed by ejecting the molded resin material as described above. Other formation methods can also be carved by the last name. Guardian forms the first diffraction light thumb 45, the second diffraction grating 46, and the third diffraction grating 47, which can also be formed by machining. In addition, the material forming the composite optical element 32 is limited to a resin material ', and a light-transmitting optical material such as a glass material may be used. Furthermore, the material structure may be changed locally by a combination of such optical materials.

The coupled optical element 32 can also be designed to have a reflective surface inside, so that i-reflective surface 'can increase the freedom of optical design by bending the optical path. In the following, in the composite optical element 32, the optical path changes from the optical disc 2 back to j due to the wavelength change of the light emitted from the light source of the self-receiving integrated type 31). Ru

As shown in FIG. 7, the composite optical element 32 uses the return light from the optical disc 2 as L, and uses the first diffraction grating 46 to separate the return light [diffracts into +1 order light and separates it from the exit light by ^, The third diffraction grating 47 is configured such that the optical path is diffracted by the second diffraction grating "separated incident light L into 4 times of light and guided to the light-receiving integrated element η. -19- 1227884 At this time, as shown in Figure 8 As shown, in the composite optical element 32, the wavelength of the reflected light is λ, the diffraction angle of the second diffraction grating 46 is θι, and the diffraction angle of the third diffraction grating 叨 is ㊀2 '. The second diffraction grating 46 The grating constant is d, and the number of gratings of the diffraction grating 47 is 1, and the number of diffractions of the second diffraction grating 46 is + ι. The number of diffractions of the third diffraction grating 47 is ", the second When the refractive index of the medium between the diffraction grating village and the third diffraction grating 47 is n, that is, when the refractive index of the resin material forming the composite optical element = 32 is 11, the following formula 8 and formula 9 are derived from the foregoing formula 3 . "Η · sinGi ^ / d! Sin02-n · sinep-X / c ^ Next, from Equation 8 and Equation 9, Equation 10 and Equation 11. • · · · (8) • · · · (9) sinGl and sinh It can be expressed as sin01-X / (d1 · η) sin02-X · (l / d ^ l / d2). Next, from Equation 12 and Equation 13 from Equation i0 and Equation η. • · · (10 ) • · · (11) C0S0i and COS0: 2 can be expressed as follows: · · · (12) • (13) 00δθι- (1-λ2 / (ά1 · η) 2) 1/2 0Οδθ2- ( 1-λ2 · (l / d1-l / d2) 2) 1/2 /, person, the second surface 42 is x = 0, from the second surface 42 to the side perpendicular to the first surface 41 as the X axis, since ^ 4,, + i The deviation of the X axis is taken as the y axis, and the second diffraction grating 46 is used as aΊ, and the first diffraction grating 45 is used as the light emitted from the disc 2 to return: When the main beam is used as the light beam 11, the light path of the light beam 11 can be expressed as the following -20- • · (14) 1227884 Equation 14 4. y = tan0i a, the light beam 丨 丨 intersects the first surface 41, that is, the position incident on the third diffraction grating 47 can be represented by the following formula 15: x = a, y = a · tan0 (15) When the return light diffracted by the third diffraction grating 47 for the first light is the light 12 ', the optical path of the light 12 can be expressed by the following formula 16. y = tan02 · x + a (tan0! -Tan02) • · ( 16) Secondly, the intersection point of the ray 12 and the x-axis is B, and the position of the point B can be expressed by the following formula: x = a (l-tan01 / tan02), y: (17) The position on the x-axis can be found from Equation 17 The diffraction angle Θ of the second diffraction grating village is related. Since the diffraction angle t is a function of the wavelength λ from Equation 8, the above-mentioned example is changed to the right, the diffraction angle θι is changed, and the coordinate of 8 points Also changing the wavelength variation of the light emitted from the mouth causes the position of the beam spot of the light-receiving area of the light-receiving integrated element 31 to change. Therefore, to determine the position of the light-emitting region of the light-receiving area of the light-receiving element 31, the wavelength does not change. They are all constant. When formulas ι0 to η are used, and the second term on the right side of the formula X of A in Formula 17 is expressed as Formula 18, -21. 1227884 d2 < d !,

tan0 1 / tan02 IsinGi / cosG ==-((d12d22 / (d2 ^ d1) 2 ^ 2) / (n2d12.X2)) 1/2 · · · · (18) At this time, formula 1 8 is substituted into the following formula 1 q 仏-^ ^ When sorting out the conditions that are not in Equation 19, it can be expressed as Equation 20 below. (η + 1) d2: = nd1 tan0 i / tan02 = -1 The X-coordinates are all constant. That is, if the $ composite optical element 32 is designed in such a manner that the grating constant 1 of the second diffraction grating 46 and the grating constant d2 of the third diffraction grating 47 satisfy Equation 19, the integrated light-receiving type due to wavelength variation The position of the beam spot of the light receiving area of the element 3 is constant. Such a composite optical element 32, for example, defines a grating constant di ^ 4 of the second diffraction grating 46, and a grating constant t of a nine-ray grating 47, because the wavelength of the light emitted from the self-receiving and light-emitting integrated element 31 changes. When the light returned from the optical disc 2 is separated from the emitted light by the second diffracted light thumb 46 and +1 times, even if the optical path of the separated reflected light is changed, the third diffracted grating 47 is used to separate the light. Diffraction of the returning light 1-entering the light 'can always appropriately guide the light returned from the optical disc 2 to a specific position of the light receiving area of the light-receiving integrated element 31. The aperture stop 33 is disposed on the optical axis of light emitted by the second diffraction grating 46 of the composite optical element 32. -22- 1227884 1227884 The objective lens 34 is emitted from the Θ light-emitting and carved element 31 by one eight centimeters, and is condensed by the opening aperture 33 to converge the light. As shown in FIG. 9, the integrated light-receiving and integrated element 31 includes: receiving the main beam of the 0th-order light divided by the first diffraction grating 45, and receiving light emitted by the first diffraction grating sideways. Beam-set photodetector 52 = with side-beam-shaped side beams. Received light-body size ㈣31 is arranged in a way that corresponds to the position of the person who shoots back the light by the composite optical element ㈣ to correct the movement of the light. The pre-body element 31 is provided with a master at the center of the ring, which is roughly jealous: Beam: Photodetector 51 ', and is respectively provided with a main beam light detection cry 51 1 sandwiched between it and located on one of the two sides. σ detectors 52, 53. ㈣ Reading side beam photodetection two light-receiving integrated element 31 main beam photodetector ^: there are light receiving areas 1 bl divided into four equal parts divided by a group of dividing lines- Cl, dl. Each light-receiving area a 丨, b ,, r ^ The three-diffraction grating 47 corrects the returned light of the optical path variation ^ 1 and enters it through the lens drive _ 3 of the first learning pickup device 3, the bracket; support The lens holder can be positioned on a bracket supporting member parallel to the focusing direction of the == optical axis and orthogonal to the tracking direction of the optical axis of the θ mirror 4 on one axis; and the lens holder can be made by electromagnetic force The driving force changes the electromagnetic driving force in the two-axis direction, so that the lens supporting mechanism of the lens supporting lens is not shown. Focus of tester 5] :: == 31 The main beam beam is detected by the photodetector 5 2, 5, 3 23-1227884. The tracking error signal detected by the objective lens 34 drives the focus lens and the tracking direction respectively. In addition, the recording of "focusing the emitted light on the recording surface of the optical disc 2", in addition, the composite optical element 32 can also use the first diffraction grating M, the second diffraction grating 46, and the third diffraction grating 47 as holograms, respectively. Element, etching treatment: It is formed by a fixed holographic pattern. In addition, if the holographic element is used, it should be a surface relief hologram or a sparkle hologram for diffraction efficiency. The light emitted from the optical disc 2 is self-feeding according to the focus error signal and the tracking error signal detected by the optical pickup device 3; the channel 10 outputs a control signal to the two-axis actuator of the optical pickup device 3 by: The objective lens 34 is driven to be located in the focusing direction and the tracking direction, and the emitted light is focused on the required recording track of the optical disc 2 through the pair: lens 34. Then, set the disc 1 to the signal demodulation circuit 12 and Error correction circuit 丨 3 pairs of optical pickup equipment 3 The read signal is demodulated and a reproduced signal is output from the interface u. Hereinafter, the optical disc device 丨 will be described with reference to the drawings to explain the optical path of the optical pickup light and the return light. As shown in the figure, when the optical disc device 1 reproduces information from the recording surface ^ of the optical disc 2, the light emitted from the self-body element 31 is divided by the diffraction grating 45 of the composite optical element ^ into three parts including 0th order light and ± 1st order light. Beam. The emitted light divided into three beams passes through the second diffraction grating 46 ′ of the composite optical element 32 and is focused on the recording surface of the optical disc 2 by the objective lens 34. From the recording surface of the optical disc 2 The light returned by 2a is divided into 0th order light and ± 1st order light by diffraction of the 24-24-1227884 two-diffraction grating 46 of the composite optical element 32, and the + 1st order light is separated from the emitted light as the returned light. And incident on the third diffraction grating 47. The return light incident on the third diffraction grating 47 is diffracted by the third diffraction grating 47, and further divided into 0 times light and ± 1 time light, the] The secondary light returns the light to the light receiving areas ai, bi, c], d of the light detector 51 for the main beam of the light-receiving element 31. 〇 At this time, the optical path change of the reflected light generated by the second diffraction grating 46 in the composite optical element 32 is corrected by the third diffraction grating 47, and the first light is appropriately incident on the main body of the light-receiving-type element 31. The light beam is used to detect the 51 areas a 丨, b ,, c 丨, dl. At this time, the 'object lens 34 is set to the optimal position for the recording surface of the disc 2 and is the focal point for the recording surface 2 of the disc 2 & In the so-called correct focus state, the beam spot shape of the return light incident on each light receiving area ai, b], d, d of the main beam photodetector 51 is formed as a circle as shown in FIG. 10B. =. The circular beam final main beam photodetector 5m shown in 3: each light receiving area ai, ei of each mouth and each light receiving area H are each received =: = Γ_34 is too close to the record of disc 2 is called Partially complex C 'astigmatism produced by the returning light separated by the second diffraction grating 46' is incident on the main beam photodetector. Figure 10A and 1 < 1 > bl, cl, dl The shape of the beam spot of the light is shown in Fig. 10A. The topographical axis extends across the light-receiving area and 0 ° wide. Furthermore, the objective lens 34 is away from the recording surface of the disc 2 in a properly focused state 'Astigmatism produced by the second diffraction grating = the light that passes by the blessed person and the wind carving, the person hits each light receiving area bc 1 of the main beam photodetector-25-1227884 5 1 The shape of the beam spot of the returning light of d 1 is shown in FIG. 10C, and the topography growth axis spans the light receiving area b! and the circular shape of the light receiving area d. Compared with the beam spot shape shown in FIG. 10A above, The system forms an ellipse whose long axis is inclined only 90 degrees in the moon direction. Therefore, when the elliptical beam spot shown in FIGS. 10A and 10C is formed, two sets of light receiving areas a !, Z, and ^ light receiving areas…, dl of the photodetector 51 for the beam are opposed to each other. The amount of light received by each light-receiving region becomes larger γ and the amount of light received by each light-receiving region of the other group becomes smaller. Therefore, in the main beam photodetector 51, each of the light-receiving areas ^ ...,, a respectively detects the output as the light-receiving area, and the s 1 focus error signal FE can be calculated as shown in Equation 21 below. 1 '• (21) FE = (Sa1 + Sc1) ^ (Sb1 + Sd1) That is, the main beam photodetector is used for the objective lens 34 and the disc 2 == when it is in the focus position. Focusing error message calculated by formula M: When the main beam photodetector 51 is too close to the object lens 34 and the recording surface 2a of the optical disc 2, the flat signal μ,, and FE are positive and the object When the lens 34 is too far from the recording surface of the light, the focus error signal FE becomes negative. As described above, for the government, 51 # ν and service light-body element 31 for the main beam photodetector ^ 1 series of straws are incident on 々 ^ ^ ^ Ψ ^ ^ ^ Wenguang area ~, bi, ci, Each beam point of d 丨 < turns out to obtain poly-, ..., iron FE #k and obtains a reproduction signal. One side of each group 45 is divided into ± 1 times using a photodetector 52 '53 Yu ㈣—diffraction grating The second diffraction grating center beam is reflected by the disc 2 to form the reflected light', and it is set to +1 The secondary light is separated from the emitted light, and then passes through the third winding -26- 1227884. The light is emitted from the thumb 4 7 correction 41 ^ ^ -r- + + correction is first double-moved and incident to inspect the director, and by calculating this light 1 time The difference between each output is two, each receiving error signal TE. The difference is obtained and the tracking error is obtained. In addition, the optical pickup device 3 is shown in the optical system 60 of the information; and the optical lens can be driven from the optical disc 2 reproduction mirror without being shown on the map. The drive mechanism for the material is not described later. The optical pickup system σ month of the system 60 "has an optical pickup system, which is roughly the same structure as the optical system 3 with the optical system 30.", σ 5 has the same symbol, and the light is omitted. The optical system 60 of the device 3 is 61 in the order of the optical path length, and it emits laser light to the optical disc m 2 Yes. The source is cut from the light source ^ I 丨, which is separated, and n will be from The first disc 2 reflects the returned light and the emitted light, and further separates and separates the emitted light from the emitted light; 33, which is to shoot the light through the light source 61 through the sweat, and 'take, the spiritual σ, especially the learning element 62 shot. =. Fixed numerical aperture NA; for the objective lens 34, which focuses the Γ light from the opening 63,1 :: on the recording surface ~ of the disc 2; and the light receiving unit ^ receives the light returned from the disc 2. The optical system 60 has: a first shield which is connected between the light source 61 and the composite optical element to shield the light beams other than the effective beam of the emitted light; the first beam required; and the second light-shielding plate 65, which is based on : The light beam 61 shields the unnecessary light beams from the outside of the effective light that is reflected back between the optical element 62 and the light receiving unit 63. The light source 61 has spontaneous The point 6la emits a semiconductor laser with a wavelength similar to that of the lightning of Jordan. As shown in FIG. 11 to FIG. 12, the composite optical element 62 forms a block shape by emitting a molding tree-27-1227884 grease material, and the light source 6 emits light. The point 61a emits the light: the near light source 61, and the first surface 81 that is orthogonal to the t-th optical axis, the specific angle of the second surface 82 ′, and the second surface 82 is inclined only. The third, which is opposite to the angle, is straight, and the opposite surface 83 and the opposite surface 81 and the second surface 82 are inclined only at a specific angle to the fourth surface 84. The second surface 81 is provided with light emitted from the light emitting point 61a of the light source 61. The first diffraction grating 75 of a beam // Λ obtains the tracking error signal te and should be referred to as the 3-point method 丨 ')' Ya by receiving the light-receiving section 63 to be the first-winding The transmission grating 75 ± 1st-order light 'detects the difference between the outputs of the primary light and performs tracking servo. A second diffraction grating 76 is provided on the side 82 of the second diffraction grating, which separates the 0th and 7th light diffractions of the reflected light from the disc 2 by the -diffraction grating 75, and further divides these into The 0th order light and ± 1st order light are separated from the optical path of the emitted light by using the small under-light as the reflected light. The third surface 83 is provided with a third diffraction grating 77, which is located on the optical path of the reflected light separated by the second diffraction grating 76, so that the reflected light is reflected and diffracted, and further divided into 0 times light And ± 1st order light, if the second order light is used as the return light, the optical path variation generated by the second diffraction grating 76 is corrected. The third diffraction grating 77 is provided with a specific reflection film 'on the third surface 83 in such a manner that the incident return light is totally reflected, and functions as a so-called reflective diffraction grating. The fourth surface 8 4 is provided with a division 稜鏡 7 8, which is located on the optical path of the reflected light which is corrected by the third diffraction grating 77 and changes the returned light into 4 -28-12 27884. section. As shown in FIG. 13 and FIG. 14, the segmentation 稜鏡 78 is formed into a roughly regular quadrangular pyramid shape, and the _ 丨 th light reflected and diffracted by the third diffraction grating 77 is near or near the focal point of the diffracted light. The center of the diffracted light is arranged so as to be incident on the center of the vertex of the regular quadrangular pyramid. The division 稜鏡 78 is located inside the composite optical element 62, and is arranged on the inside side toward the vertex angle. That is, the division 稜鏡 78 is diffracted by the 0th light of the three beams divided by the first diffraction grating 75 by the second diffraction grating 76, reflected and diffracted by the third diffraction grating 77, and incident. Configured at the top corner. In addition, the division 配置 78 is arranged such that the bottom of the regular quadrangular pyramid faces the optical axis of the 4th light reflected and diffracted by the third diffraction grating 77 orthogonally. The composite optical element 62 passes through the return light separated by the second diffraction grating 76, and imparts only a certain amount of astigmatism to the return light incident on the division chirp 78. By adjusting the position of the composite optical element 62 in the optical axis direction of the light emitted from the light source 61, the defocus on the optical disc 2 can be easily adjusted. The composite optical element 62 is formed by injection molding a resin material as described above. Other formation methods can also be formed by the above-mentioned first diffraction grating 75, second diffraction grating 76, third diffraction grating "and division 稜鏡 78 by etching. In addition, forming a composite The material of the optical element 62 is not limited to a resin material, and a light-transmitting optical material such as a glass material may also be used. Furthermore, the material structure may be locally changed by a combination of these optical materials. The composite optical element 32 is similarly described in the description, such as calculating the grating constants of the second diffraction grating 76 and the third diffraction grating 77 and the angle between the third surface μ and the 29th-1227884 second surface 82 to design the composite optical element. 62. Correcting the change of the optical path length of the reflected light due to the wavelength and the interaction can correctly guide the reflected light to the top angle of the division 稜鏡 78. The composite optical element 62 thus designed is used to emit light from the light source 61. When the wavelength of the emitted light changes, the light returned from the optical disc 2 is diffracted by the second diffraction grating% into +1 order light and separated from the emitted light, even if the optical path of the separated returned light is changed, Three diffraction gratings 77 The reflected light is reflected and diffracted into q times light, and the light returned from the optical disc 2 is always directed to the top angle of the division, so that each of the reflected light divided by the division 7 and 8 can be correctly guided to the light receiving unit. The specific position of the light receiving area of 6 3. The aperture stop 33 is arranged on the optical axis of the light emitted by the composite optical element like the second diffracted light thumb 76. The objective lens 34 is composed of at least a Hgl convex lens, and will be a light source 6 ι The light is emitted, and is condensed on the optical disc 2 by the light condensed by the aperture 33. As shown in FIG. 5, the light receiving unit 63 has: a master who receives the 0th-order light divided by the first diffraction light thumb ^ Beam detector 91 for the main beam of a roughly square beam, and a pair of side beams of a roughly stripe type, each receiving two side beams of ± 1st order light divided by the first diffraction grating 75 Photodetectors 92, 93. The light receiving unit 63 is arranged at a position corresponding to each of the reflected light that is divided by the composite optical element. The light receiving unit 63 is arranged in the center and has a roughly square shape: the beam. A photodetector 91 is provided, and the main beam photodetector 91 is sandwiched between On the two sides, a set of side-by-side photodetectors 92, 93 with a roughly band shape. -30-1227884 The light detector 9 for the main beam of the light section 63 has a set of knife and auxiliary lines that are orthogonal to each other. It is divided into four equal light receiving areas a2, dagger, C2, d2. Each light receiving area hh is irradiated with the reflected light divided by the divided 部分 78 into four parts within ten days. The first-shield plate 64 A roughly circular opening is provided between the light source 61 and the composite optical element 62 corresponding to the effective light beam of the emitted light. The opening restricts the unnecessary light beams other than the effective light beam to prevent diffused light from entering the composite optical element 62. The second light-shielding plate 65 is provided between the composite optical element 62 and the light receiving portion 63 with a roughly circular opening corresponding to the effective light beam emitted, and an unnecessary light beam other than the effective light beam is blocked by the opening limit. It is possible to prevent the diffused light that has not passed through the division prism 78 in the composite optical element 62 from entering the light receiving portion 63. In addition, the shapes of the openings of the first light shielding plate 64 and the second light shielding plate 65 are the same.

The shape is not limited to a rough circle, and other shapes such as a rough oval and a rough polygon may be formed. V The first light-shielding plate 64 and the second light-shielding plate 65 shown in FIGS. 4 and 15 are only provided with light corresponding to the 0th order divided by the first diffraction grating 75, that is, corresponding to the main beam. The shape of the opening, but it also needs to be set corresponding to the soil ^ times: that is, corresponding to the opening of the side beam, or to change the shape of the opening. The picking device 3 has ... <镜 Mirror support for object-to-object 34; support for the lens holder can be displaced in two axis directions parallel to the focusing direction of the objective lens ^ optical axis and orthogonal to the tracking direction of the optical axis of the objective lens 34 ; And by electromagnetic force ^ lock 1227884 wood 焉 £ dynamic change in the two-axis direction of the 浐 浐 movement but not shown in the figure. The main beam of the focusing beam is detected by a photodetector ^ ;;; the detection of the light detection ㈣, the tracking of the 93 detection respectively drives the objective lens 34 in the focus direction and the tracking ° to make the emitted light focus on the record of the disc 2 Face ~ on the recording track. 2 'The split prism 78 of the above-mentioned composite optical M62 may also be formed like an octagonal pyramid. In this case, the photodetector for the main beam and the main beam may be divided into eight parts from a radial dividing line broken from the center of the light receiving surface. In addition, the division 稜鏡 78 of the composite optical element 62 is provided on the inner side with respect to the fourth surface 84, but it may be provided on the outer side with respect to the fourth surface M. In addition, the division 稜鏡 78 of the composite optical element 62 is not limited to a pyramid having a flat surface, and may have a shape having a plurality of curved surfaces. In this case, it is set so as to correspond to the divided area of the main beam photodetector 91 of the light receiving section 63. Furthermore, the composite optical element 62 can also be formed by using the first diffraction grating 75, the second diffraction grating 76, and the third diffraction grating 77 as holographic elements, and etching a specific holographic pattern. In addition, in the case of using a hologram element, it is preferable to use a surface relief hologram or a blazed hologram to improve diffraction efficiency. As shown in FIG. 16, the composite optical element 62 uses a grating 79 divided into four regions instead of the division chirp 78, and the same effect can be obtained. At this time, in order to obtain the same effect as the division 稜鏡 78, the grating 79 is provided with divided regions y1, y2, y3, and y4, and the directions of forming grooves in the divided regions y !, y2, y3, and y4 are different. . Specifically, the direction in which the grooves of the divided areas yi and h are formed and the direction in which the grooves of the divided areas and y4 are formed are orthogonal to each other. The grating 79 responds to the groove directions and grating constants of each of the divided regions y !, y2, y3 'and y4 in accordance with -32-1227884. The incident light from the disc 2 is diffracted and divided into four parts, and is guided to the main beam of the light receiving part 63. Beam photodetector 91. The grating 79 is formed as a hologram element by a hologram pattern specific to the etching process. In addition, in the case of using a holographic element, a surface relief type hologram may be used, or a blazed hologram may be used to improve the diffraction efficiency. Furthermore, the composite optical element 62 may also be designed to have a reflective surface on the surface. Reflecting surface '#The freedom of optical design is improved by the curved optical path

Furthermore, 'because the composite optical element 62 is made to be incident on the division 稜鏡 78! The angle of incidence of the light returned by the first disc 2 forms a sub-center for the faces of the division prism ^, which is also the inclination of the faces of the division 稜鏡 78 Form 45. In the following, the angle of refraction can be increased in a way to prevent incident incident light from entering the DZ wood pieces of the total reflection bar. Therefore, it can be separated from each of the divided reflected lights by a few meters, and the main beam can be enlarged. Intervals of the divided regions in the detector 91 and the main beam photodetector 9114 side beam photodetector

Combined precision of device 3. % Between ^ can be relaxed optical pickup with the optical system 60 with the above optical set 1 wrong shot from the optical disc 2 J You yiyi according to the focus of the optical pickup device 3 detection 4 the determination number and follow-up ^ ,, "The light N enters the enemy." The servo circuit 10 rounds out the control signal to the two axes of the optical pickup device 3-I is mainly located in the focusing direction and the objective lens 34 is driven to change in the direction of the light beam U 2 respectively. The demodulated circuits U and 的 are combined with the emitted light through the objective lens 34 and combined with the required records of 、 7 and 栗 2. Then, the optical disc device 1 performs a demodulation process and a signal on the -33 · 1227884 signal read by the optical pickup device 3 through the signal positron circuit 13. < After the decision 3 is processed, the output from the interface u is less than the following, is it equipped with a Umbrella Umbrella μ? I first set the optical pickup device 3 of the optical system 3 to 1, and the photo is ^^^ ㈡ 式 ^ Brother first learns the light emitted from the pickup device 3 and returns to the optical path in particular. TFigure U 'The optical disc device 1 reproduces information from the recording surface 2a of the optical disc 2 'The light emitted from the light source 61 is shielded by the first-shielding plate 64. Unnecessary light is emitted. Only the effective light beam is incident on the composite optical element, and is divided into the first optical diffraction grating 75 of the composite optical element 2 to include the light. 3 beams of the secondary light and ± 1st light. The output light divided into 3 beams passes through the composite optical element and the second diffraction grating 76 is focused on the recording of the optical disc 2 by the objective lens 34 Surface 2 "The light returned from the recording surface 2a of the optical disc 2 is diffracted by the second diffraction grating 76 of the composite optical element 62, and is introduced into the optical path toward the third surface 83, and +1 times of light is incident on the third winding Shooting grating 77. The + 1st light from the -diffraction grating 76 incident on the third diffraction grating 77 is reflected and diffracted by the third diffraction grating 77, and the -1th light is incident on the top angle of the division 稜鏡 78. The first light of the regular quadrangular pyramid apex angle of the human poetic division edge is reflected by the humans on the peripheral surface of the regular quadrangular pyramid, respectively refracted in different directions, and is divided into four reflected light, and the second The light shielding plate 65 blocks unnecessary light, and only the effective light beam is irradiated to each light receiving area of the main beam photodetector of the light receiving section 63 ... b2, e2, 'diffracted light diffracted by the third diffraction grating 7 7 When incident at the vertex angle of the division 稜鏡 78, the objective lens 34 faces the recording surface of the optical disc 2 as shown in FIG. 17B. Diffuse light forming a roughly circular shape is incident on the top corner of the Nichi-Shou 'divided 稜鏡 78 located at the focal position. -34- 1227884 In addition, when the diffracted light is incident on the top angle of the division 稜鏡 78, as shown in Figure 7A, when the objective lens 34 and the recording surface 2a of the optical disc 2 are too close, the objective lens 34 deviates from the focal position. Therefore, due to the astigmatism generated by the diffracted light passing through the composite optical element 62, a long axis forms an elliptical diffracted light in the upper right of the figure at the top angle of the division 稜鏡 78. When the diffracted light is incident on the top angle of the division 稜鏡 78, as shown in Figure i7c, when the objective lens 34 is too far away from the recording surface 2a of the disc 2, the objective lens 34 deviates from the in-focus position. Astigmatism due to diffracted light passing through the composite optical element 62

‘Yu Fenyu! ] Prism 7 8 on the top corner of man 4 4-H i I is incident on the moon with a long axis forming the elliptical diffracted light in the upper left of the figure. Therefore, when the objective lens 34 is deviated from the apex angle of the division 稜鏡 78, most of the diffracted light is incident on the peripheral surfaces Xi, x3 and x2, X4, and the diffracted light is emitted. In the state of the focus position, the two groups of diffracted light entering the segmentation 稜鏡 78 opposite to each other are divided into the areas where there is little incident on the peripheral surfaces of one group and the peripheral surfaces of the other group, as shown in Figure 1 7 As shown in Fig. A, the diffracted light with an elliptical shape is incident on the spectroscope 78, and the majority of the diffracted light is directed toward the mirror Ø], and is incident on a set of opposite peripheral surfaces X 丨, > A very small portion of the light is emitted in a relatively long-lasting group. In addition, as shown in Fig. 17C, it was her turn. On the peripheral surface x2, > Most of the diffracted light on the mirror 78 is projected on a set of relatively long nets, and a small part of the diffracted light enters the & mouth. The plane χ2, > is incident on a set of opposite perimeters, and is divided by the first diffraction grating 75 points, and the second diffraction grating 76 is formed by the self-light in the 0th order of light, ^ » Shooting back light 1 i-personal light, hunting by this

h 'X3, X4 are refracted by different sides I 1227884, so they are divided into 4 pieces of reflected light and incident on the light receiving areas a2, b2, C2 of the main beam photodetector 9 1 of the light receiving section 63 respectively. , D2. Therefore, as shown in FIG. 18A and FIG. 18C, the two groups of light receiving areas h of the main beam photodetector 91 facing each other are formed so that the amount of light received by each of the light receiving areas of one of the groups I and I becomes larger. And the amount of light received by each light receiving area of the other group becomes smaller. That is, when the elliptical diffracted light shown in FIG. 17A is incident on the division chirp, as shown in FIG. 18A, the main beam photodetector 91 receives a larger amount of received light with respect to each light receiving area h, 4 and In each light receiving area, the amount of receiving 2 is reduced. The elliptical diffracted light shown in Fig. I 7c is incident on the divided 稜鏡 78-inch, and the main beam photodetector 9 1 is shown in Fig. 1 8C. The received light amount of each of the light receiving areas b2 and d2 changes. , And the amount of light received by each light receiving area ^ 'c2 becomes smaller. 2 When the circular diffracted light shown in FIG. 17B is incident on the top angle of the division, as shown in FIG. 18B, the main beam photodetector 91 is opposite to each light receiving area ", c and each light receiving area h 1 The amounts of light received are equal. 2 Therefore, in the photodetector 91 for the main beam, each of the light-receiving areas ^ e and d2 detects the respective outputs as ^, called,%,%. Focusing error = signal FE can be as shown below Calculate by formula 22. FE = (Sa2 + Sc2) ^ (Sb2 + Sd2) · · · · (22) That is, the main beam photodetector 91 is located on the objective lens 34 and the recording surface 2a of the disc 2 At the focus position, the focus error signal calculated by formula 22 is ^ l; FE is 0. In addition, the photodetector 9m for the main beam is too close to the objective lens M and the recording surface 2a of the disc -36-1227884 2 When the focus error signal 叩 is positive and the objective lens w is too far away from the recording surface 2a of the optical disc 2, the focus error signal FE is negative. As described above, the light detector 91 for the main beam of the light receiving section 63 is The focus error signal FE is obtained by outputting the light beams incident to the light receiving areas a2, b2, C2, and the heart, respectively, and a reproduction signal is obtained. The light detectors 92 and 93 for each side beam detect the respective light receiving amounts of the light reflected from the optical disc 2 among the ± 1 times of light emitted by the first diffraction grating 75, and calculate each of these first light. Output the difference, and get the tracking error signal D.

As described above, the optical disc device 1 controls the lens driving mechanism based on the focus error signal π and the tracking error signal TE ′ servo circuit 1G obtained by having the optical system 30 or the optical system 60 first to the pickup device 3, Xiao The objective lens 34 is driven and positioned in the focusing direction and the tracking direction, respectively, so that the emitted light is focused on the recording surface 2 & of the optical disc 2, and information is reproduced from the optical disc 2. As described above, the optical disk device 1 of the present invention has the optical system 30 of the light # The pickup device 3 has a composite optical element 32, which is provided with a second diffraction of light diffracted from the disc 2 Raster *; and will be

The incident secondary light is used as the returning light, and the diffraction is further stepped with the phase diffraction grating 47; even if the oscillation wavelength of the emitted light emitted from the self-receiving light-emitting element 31 changes due to the ambient temperature change, it can still be guided Compared with the conventional system at the appropriate position, the use of no additional parts can make the obtained focus error and thus the reliability of the optical pickup device signal FE of the optical pickup device 1 and the optical pickup device of a simple structure in the previous optical coefficient improved. The optical pickup device 3 with the optical system 6 set to the optical disk I is set to have a composite optical element 62 of -37-1227884, a total% diffraction grating 76; will be borrowed; two: the light diffracted from the optical disk 2 The second diffracted light, further diffracting the diffracted first grating +1 times of light as the minor diffracted by the third diffractive grating 77 :: = grid: '· and split the borrowed light The eighth part of the four parts is the light that returns the light, and the light emitted from the optical element 61; Even if it is cut due to ambient temperature changes. The variation of the wavelength of the emitted light of the vibrating disk can still be directed to the optical disk device i and the previous optical quantity of the simple structure of the wind fighter. The reliability of the signal FE is improved. Another problem ..., error In addition, because the optical disc device 1 is present in the device 3, only & a /, ..., and the optical pickup with the optical system 3 is only used to couple optical elements 32 separation such as mountain, self-receiving luminous ^-$ exit and return light, the function of correcting the range change, so it can ... = the luminosity caused by the previous wavelength change, simplifying the well and keeping the number of advance tea pieces to the necessary minimum The structure of the first learning system 30 promotes costs. Miniaturization and reduced manufacturing. Therefore, the optical pickup composite optical element 32 of the optical disc device 丨 can improve the reliability of the optical system 30 in the ancient clothing 3. In order to "productivity" reduce manufacturing costs, and increase the "returning light produced by the optical disc device 丨 equipped with light" "only separated by the composite optical element 62, the wavelength of the emitted light emitted from the 3 sources of clothing, Correct from The function of the optical path variation of light, and light, because the number of π light to the number of parts is kept to a minimum, stop / take a small limit, simplify the structure of the optical system 60, promote miniaturization, and reduce manufacturing costs. -38- 1227884 Therefore, 'the optical system in the optical pickup device 3 of the optical disc device 1 is a composite optical element 62', which can improve productivity and reduce ancient reliability. Yatuo optical disc device 1 uses Douyouduo Xuebei 1 excellent /, optical pickup device 30, and especially the optical pickup device 30, the system is formed by using a light source and a light receiving element-a body-receiving light emitting type 1 element # 31 Optical unit, so you can further reduce the number of parts while achieving cost reductions. The optical disk device is combined with an optical element 62 by an optical pickup device having an optical system 60, and the composite optical element 62 has a split self-reflection: the first split 78, which is used in conjunction with the main beam. The form of the split beam point of the photodetector is more than the car's division of the reflected light on the optical path, so: == 4 divided by 78 divided by 4 ways of the reflected light, the main beam is detected by light Each of the light-receiving areas a2, 91, & of the 91 is held in a specific size, and: See the precise position required for the division position of the main beam photodetector. However, the optical disc device i can reduce the main beam of the optical pickup device 3: the "manufacturing cost" of the optical pickup device 3 and the optical pickup device 3 is manufactured-= the main beam is adjusted to the position of ㈣㈣, which can improve the focus error signal Reliability of FE. Where it comes from: Chinese clothing set 1 is equipped with an optical pickup 60 with an optical system 60 and has a younger-shielding plate 64 ', which is only from the light source. Emission of the emission: Set 3: beam Γ composite optical element 62 'Blocking the incident on the composite optical element 62: the first thing you need' can reduce the diffuse reflection in the composite optical element M. The optical disc device 1 has the right "m" by the right side of the "", and has a priori The optical pick-up device 3 of the system 60 has a younger board-65 ', which only guides the effective light beam transmitted through the composite optical element to return light-39-1227884 to the light receiving section 63, and does not need to cover the incident light entering the light receiving section 63. The Light 'improves the reliability of the light detection level of the light receiving section 63 of the South. In addition, the optical pickup device having the optical system 60 in the optical disc device 1 is not limited to having the first light shielding plate 64 and the second light shielding plate 65 as shown in FIG. 12, and may be coated on the surface of the composite optical element 62 as shown in FIG. 12. A light-absorbing coating is applied, and an opaque film is vapor-deposited on the surface of the composite optical element 62, or the surface of the composite optical element 62 is roughened to block unnecessary light.丄 The optical disc device i is used to obtain the focus error No. 4 FE in the optical pickup device 3 described above. The so-called astigmatism method is used, but other detection methods such as the Foucault method can also be used. In addition, when the optical disc device is not easy to constitute the "fixed element" of the composite optical element 32 and the composite optical element 62 as described above, #the optical system is formed by individually forming the optical system with the same configuration as the above. Get the same functionality. The following will describe a configuration example of the optical pickup device 3 which does not consist of one element of the composite optical element 32 and the three composite optical elements 62, but includes an optical system in which each optical element is arranged in the phase sequence described above. In addition, the optical pickup device with the above-mentioned composite optical element 32 or composite optical element 62 also has an optical system that compensates for the change in optical path length. However, the optical humiliation I shown in the following example shows the optical system with corrected astigmatism System example. First, as shown in FIG. 19, the optical pickup device 3 of the first example includes: an optical system 100 for reproducing information from a self-driving disc 2; Lens drive mechanism for light two. With: + to the optical pickup device 3 of the system 100, the structure shared with the optical pickup device 3 having the teacher ... or 60 is noted, and the 1227884 symbol in common is noted and its detailed description is omitted. The optical pick-up device 3 is provided with,, and some of the predecessors of the system 100 in accordance with the order of the optical path has a light source 1 0 1 ', which emits laser light to Wang Jiu disc 2, the diffraction grating 102, which is The light emitted from the 501 light source 101 is divided into three parts; the beam splitter 1 03, which is divided by the diffraction grating 102 into three parts ',', | knife < emission light reflection , And the light reflected from the optical disc 2 is transmitted; the opening aperture 10 is to condense the light reflected by the beam splitter 103 into a specific numerical aperture na, and the objective lens 105 It is caused by the opening aperture 104. Pingbing • Youyuan 1υ4 ♦ The first emitted light is condensed on the recording surface 2 a of the disc 2 'splitting prism 1 06, 1 will be transmitted, and the percentage will pass through the beam splitting The light emitted from the device 1 03 is divided into 4 parts: the heart, the a 'knife, and the light unit 107, which receive the returned light separated by the divided 稜鏡 106. The light source 101 is, for example, a semiconductor laser having a self-luminous point 101 that emits laser light with a wavelength of about 780. Diffraction grating 1 0 2 divides the light emitted from the source 101 into three successive parts: 0th order light and 1st order light; ML ,, I 刀 旳, 70% of the shots are emitted, and the direction of dispersion of the emitted light is formed by the recording master of the optical disc 2. In order to obtain the tracking error ancient Wu signal TE, the universal universal learning system 1 uses the so-called Dpp (differential push-pull) method, and uses the light receiving unit to receive ± 1st light divided by the diffraction grating 1G2, Structure of tracking servo. The beam splitter 103 includes the first surface 103a and the second surface Satoshi

Sexual parallel flat members, including Chu, A. Ran Yanya's side 103a and second side 10 flutter the light emitted from the source 101 to the right to make it tick AA + 丄 艽 /, with a 4 inch angle It is configured and reflected from the light source ιοί 出 出身 + 屮 # from the first side 103a, and then the first side of Qiding is emitted, and it is guided to the disc 2 side, and the reflection reflected by the disc 2 is passed through the side 103a and the first side. On both sides, 10 讣 and -41-1227884 lead to split 稜鏡 106. The knife beam is 103, and the light returned from the optical disc 2 passes through, and only a certain amount of astigmatism is given to the light returned to the split edge 敕. The beam splitter 103 adjusts the defocus of the optical disc 2 by correcting the emission 9 σ σ emitted from the light source 101. , "From the position of the direction ', you can easily call it out:; = The first surface of the beam device _ is provided with a reflective self-light source_, and the semi-reflective mirror surface through which the light returned from the optical disc 2 passes. This The image of θ ^ 103 is provided with a correction on the second side of the 10th. The light emitted from the optical disc 2 is corrected: the diffraction element of the image 1 passes through the beam splitter, and the astigmatism of the reflected light is appropriate. Correction of the focus adjustment method. +% ^ ≪ Protection of the image to protect ~ ~ 80 Yatsuchi self-diffraction 70 pieces can also be etched by the 2 "pattern to form a holographic element. When a hologram element is used, it is the surface relief self-emission efficiency. … 'Can also be a holographic blaze to increase the aperture HM around the opening. In order to converge the light in a specific numerical aperture, it is arranged on the first axis of the beam splitter 103. The surface 103 & reflected light emitted from the objective lens 105 is condensed by at least u, ψ, ψ ^ ^, brother, Ya, is emitted from the light source 1 0 1 and is focused by the π aperture 1G4 condenser On configuration. As shown in Fig. 20 and Fig. 21, "Divided 稜鏡 ⑽ forms a roughly regular quadrangular pyramid" and focuses on or near the focal point of the reflected light transmitted through the beam splitter 103. The top corners of a regular quadrangular pyramid are arranged in the center. Minute,

Please place it on the return light beam passing through the beam splitter ⑻ and divide the return 夂 light into 4 parts. $ U -42- 1227884 Jingjing 106 is the three beams divided by the diffraction grating 102. It is arranged in such a way that the secondary light is incident on the vertex. The division 稜鏡 106 is arranged such that the bottom face of the regular quadrangular pyramid is orthogonal to the optical axis of the third beam divided by the diffraction grating 102. The split ridge 106 is formed by injection molding a resin material. In addition, the material forming the division 稜鏡 106 is not limited to resin materials, and optical materials such as glass materials that have translucency can also be used. Furthermore, the material structure can be changed locally by combining materials such as: learning materials. As shown in FIG. 22, the light-receiving unit 107 includes a photodetector 概略 of a roughly square main beam that receives a main beam of the 0th-order light divided by the diffracted light thumb 102, and each receives a diffraction grating. One of the two side beams of the ± 1st order light divided by 102 is a photodetector U2, 113 for a sideband beam having a roughly band shape. The light receiving unit 107 is arranged at a position corresponding to each of the reflected light divided by the division and division. A light detector 111 ′ for the main beam, which is located in the center and has a roughly square shape, is arranged in the light receiving section 107 and the main light detector for the main beam is sandwiched therebetween.

A group of outline squares located on both sides of the evening / day, + + 6I side beam photodetectors 112, 113. The main detector of the light-receiving unit 107 is an ancient person, and the first detector 1U has a light-receiving area a3, b3, ... d3 divided into four equal parts by a group f secant which is orthogonal to each other. Each receiver, ′ product, or J h C3, 廿 3 irradiates each of the reflected light divided by the divided 部 I 06 into 4 parts. The light-receiving unit 1 07 is used for side shooting. 13 has a light-receiving shovel divided by a secant line into two equal parts, respectively, and especially a light-receiving area ^, f3, and a light-receiving area g3, h3. Each light-receiving area e3, the inner sister-in-law, r -..., one-to-square that emits light corresponding to the ± 1 order of light divided by the diffraction grating 102 from the disc 2 is irradiated within each light-receiving area g3, h > 43-1227884 corresponds to the other side of the ± 1st order light divided by the diffraction grating 102 from the optical disc 2. The lens driving mechanism of the photon picking device 3 includes: a lens holder holding the objective lens 105; the lens holder supporting the lens holder can be parallel to the focusing direction of the optical axis of the objective lens and perpendicular to the objective lens 1G5 The holder-cutting member that is displaced in the two-axis direction of the chasing direction of the optical axis; and the electromagnetic driving portion that changes the lens holder drive to the two-axis direction by electromagnetic force, and does not display. The non-lens driving mechanism makes the target objects according to the focus error signal detected by the main beam photodetector ⑴ of the light receiving unit 107 and the side beam photodetectors ii 2 and 丄 i 3 respectively. The lens is driven to be located in the focusing direction and the tracking direction, so that the emitted light is focused on the recording track of the optical disc 2 to the recording track. 0 The optical disc device i having the optical pickup device 3 having the above-mentioned optical system 1 is based on the photon pickup device 3 With the focus error signal and tracking error signal detected by the light returned from the optical disc 2, the control signal is output from the servo circuit 10 to: the two-axis actuator of the pick-up device 3, and the objective lens 105 respectively The driving dual is located in the focusing direction and the tracking direction, and the emitted light is focused on the required recording track of the optical disc 2 through the objective lens 105. Then, the optical disc device 1 performs demodulation processing and error correction processing on the signal read by the optical pickup device 3 through the signal demodulation circuit 12 and the error correction circuit 13, and then generates a benign signal from the interface. In the following, the path lengths of the emitted light and the returned light of the optics having the optics described above in the setting 3 will be described with reference to the drawings. . -44-! 227884 When the optical disc device 1 reproduces information from the recording surface 2a of the optical disc 2, as shown in FIG. 19, 'the emitted light emitted from the light source 1 0 1 is divided by the diffraction grating 10 to include 0-degree light and ± 3 beams of primary light. The emitted light, which is divided into three beams, is reflected by the first surface 103a of the beam splitter 103, is focused by the opening aperture 104 to a specific numerical aperture, and is focused by the objective lens i 〇5 It shines on the recording surface 2 EL of the optical disc 2. The light returned from the recording surface 2a of the optical disc 2 is refracted by the first side & of the beam splitter 103 and passes through the beam splitter 103 and is refracted by the second side 103b, which further corrects the astigmatism amount, corresponding to The returned light of the 0th light divided by the diffraction grating 102 is incident on the top angle of the division chirp 106. The reflected light incident on the apex of the regular quadrangular pyramid which is divided into 6106 is refracted by being incident on the peripheral surfaces of the regular quadrangular pyramid, respectively = different directions, and is divided into four reflected light, and Each of the light receiving areas a3, b3, C3, and VII of the main beam photodetector 光 irradiated to the light receiving section 1G7. In addition, one side corresponding to the primary light of the earth divided by the diffraction grating 102 and transmitted through the beam splitter 103 is irradiated to each light receiving area of the side light receiving detector 112 on the side of the light receiving section ... f3, The other side irradiates each light receiving area of the side beam photodetector i 13 of the light beam unit 1G7 ^, at h3 ° 1 'the light returned through the beam splitter 103 is incident on the top of the split prism ::' As shown in FIG. 23B, 'the objective lens 105 is opposed to the recording surface of the optical disc 〜 is located at the time of placement', and a return light having a substantially circular shape is incident on the top corner of the division 稜鏡 106. One more =, when the reflected light is incident on the top angle of the division 稜鏡 106, as shown in Fig. 2, the recording surface of the objective lens 105 and the disc 2 is too close to the object through -45-1227884 lens 1 〇5 deviates from the in-focus position. Therefore, due to the astigmatism generated by the returning light passing through the beam splitter w, the elliptical returning light is at the top angle of the segmentation 6106 and the upper right is the oval shape. When a long wheel is incident in the figure, when the reflected light is incident on the vertex angle of the segmentation 稜鏡 106, it is as shown in Fig. 23c. Too far, aim at the objective lens]. Second: The focus position ‘therefore’ is because the reflected light passes through the beam splitter 103 and is produced at the apex angle of the split 稜鏡 106 with a long axis incident on the top left corner to form the second left circular return light in the figure. t Therefore, when the objective lens 105 is deviated from the in-focus position, when it is projected at the top angle of the dividing edge, the 'partition 2 of the 106' is divided into one on Monday and one on the periphery. Each of the peripheral surfaces of one group is incident on the majority of the exit openings and returns light on the peripheral surfaces of the other group. The position v =, as shown in FIG. 23A, the returning light incident mirror 10 formed in an oval shape, most of the returning light is incident on the opposite peripheral surfaces of the-group, and a very small part of the returning light is incident. The relative peripheral surfaces of the Yu-group X6, χ:. As shown in Fig. 23C, an elliptical shot 8 t is formed, such as the division 稜鏡 106 where the shot 1 of the gate 1 is incident first. Most of the first incident on each of the perimeters of a group is incident on the opposite perimeter of a group. The light reflected from the first disc 2 is divided by the diffraction grating 10 and incident on the peripheral surfaces X5, P! Ancient A7 of the division 稜鏡 106, and refracted by each and not purely returned by the division. The light is incident on each light-receiving area M of the photodetector 束 of the light-receiving portion ι, respectively. As shown in FIG. 24A and FIG. 24C, the main beam photodetectors ⑴ -46-1227884 are opposite to each other in two groups of light receiving areas ^, C3 and each light receiving area, and each of the light receiving areas in one of the groups receives The amount of received light increases, and the amount of received light in each of the light receiving areas of the other group decreases. In other words, when the elliptical reflected light shown in FIG. 23A is incident on the divided light beam 106, the photodetector for the main beam i 丨 丨 is shown in FIG. 24A. The amount of light is increased, and the amount of light received by Seven is smaller than that of each light receiving area. When the elliptical reflected light as shown in FIG. 23C is incident on the segment 稜鏡 106, as shown in FIG. 24C, the main beam photodetector 111 receives a larger amount of light than the light region h. In addition, the amount of light received by each of the light receiving regions a3 and c3 is reduced. When the circular reflected light shown in FIG. 23B is incident on the apex angle of the divided beams, the main beam is detected by light HU! As shown in FIG. 24B, the light receiving amounts of a light receiving area b3 and d3 are equal. Therefore, the main beam uses a light detector 丨 丨 丨 at each light receiving area ^ h

The output A of each round detected by ′ 1 is Sa3, Sb3, Sc3. When called, the focus error signal FE can be calculated as shown in Equation 23 below. M = (ba3 + Sc3)-(Sb3 + Sd3) That is, the main beam is detected by light 1 J 111 when the objective lens 105 is positioned in focus with respect to the disc 2-recording surface 2a, ^ ^ ^ n L Focus error calculated by A formula 23! Disk ... Xy ~, the beam detector is held on the objective lens 1. "When the recorded surface 2a of Xiandisi 2 is too close to 0 ..., Xiande 1 Lu 5 Tiger FE is positive, and the lens 4 is 105 away from the recording surface of disc 2. ^ ,,, μ. U Focus error signal FE As described above, the main photodetector 107 and the photodetector Π 1 for the beam are incident on each of the photoreceptor areas a 3 b3 'C3' 7 The output of each beam point

The focus error signal FE is received and the reproduction signal is received. In addition, a group of long marriage ancient F ★ Beam photodetectors 112, 11 3 with each light receiving area e3, f3, g3, ^ _ _ v Nine dishes 2 divided by the diffraction grating 1 02 in the light returned The amount of light received by the primary light of the earth. Therefore, when the respective light-receiving areas e3'f3h of the side-beam photodetectors 112 and 113 respectively detect the outputs Se3, Sf3, Sg3, and Sh3, the tracking and block signal TE can be expressed by the following formula 24 calculations. TE = (Sa3 + Sc3)-(Sb3 + Sd3) -a ((Se3-Sf3) + (Sg3-Sh3)) The astigmatism amount can be appropriately corrected by the second side 10 of the beam splitting 103, and the return light can be divided into 4 parts by the division 稜鏡 _, so that the return light can be appropriately guided to each of the light receiving portions 107. region. As shown in FIG. 25, the optical pickup device 3 of the first example of a person has: an optical system 12G for reproducing information from the optical disc 2; and the optical line i2G having a lens drive not shown in the figure for later displacing the objective lens drive mechanism. In the following, the optical pickup device 3 having the optical system 120 is used, but the structure common to the optical pickup device 3 having the optical system 100 is denoted by a common symbol and its detailed description is omitted. The optical system i 2O of the optical pickup device 3 has, in order of optical path, a light source ιοί, which emits laser light onto the optical disc 2; a diffraction grating 102, which divides the light emitted from the light source ιοί into 3 parts; beam splitter 123, which is -48-1227884 to separate the optical path of the emitted light divided by the diffraction grating i 〇2 into 3 parts and the light returned from the optical disc 2; The output light separated by the beam splitter 123 is condensed into a specific numerical aperture NA; the objective lens is a focusing lens which focuses the output light condensed by the aperture stop 104 on the recording surface 2a of the optical disc 2;稜鏡 106, which divides the light J returned from the optical disc 2 through the beam splitter 123 into 4 σ 卩, and the Ministry of Light and Light 丨 〇7, which accepts the return of the divided 稜鏡 丄% separation Light. The beam splitter 123 is a light-transmitting parallel flat plate member including a first surface 123a and a second surface 12 and has a specific angle of 12% on the first surface 123a and the second surface to the light emitted from the light source 101. It is configured in a manner such that the f light emitted from the light source 1G1 is reflected by the first face center and guided to the disc 2 side, and the reflected light reflected by the disc 2 is transmitted through the first surface i23a and reflected by the second surface ㈣ and then transmitted through the first surface. -Noodle coffee instead of split coffee. One side 123b of the beam splitter 123 forms a total reflection surface, and the second surface is formed by a base mineral reflection film, etc., and the total reflection reflects light. The beam splitter 123 passes through the first shot from the optical disc 2 and only imparts the astigmatism on the returning light of the person who hits the split prism 10 6. The beam splitter 123 can easily adjust the defocus on the disc 2 by correcting the light emitted from the light source 1 0 1, especially the position in the anterior axis direction. Cut η at this time on the first side of the beam splitter 123 ^, the emitted light 弁 6, 3 set with reflection from the light source 101: first: out, the sub-beam transmitted by the light returned from the optical disc 2 The first side 123a of the device 123 is towards this. ^ ^, The emission area of the light returned from the optical disc 2

Within the domain, there is a correction element for the light emitted from the disc 2 to emit E points. The diffraction element of the astigmatism amount of the ten priests passes through the astigmatism amount of the returned light through the blade end state 123. For the focus adjustment method, correct -49-1227884. This kind of diffractive element can also form a holographic element by processing a specific holographic pattern with silver engraving: in the case of a holographic element, it should be a surface relief hologram or a flashing hologram to improve diffraction efficiency. As shown in FIG. 20 and the figure, the split prism 10 is formed into a roughly positive four corners, and the focal point of the returned light transmitted through the beam splitter 123 is near the focal point. Way configuration. The beam splitter ⑽ is located on the optical path of the returned light passing through the beam splitter 123, and divides the emitted light into 4 parts. The light monument device 1 provided with the optical pickup device 3 having the optical system 120 as described above is output from the servo circuit based on the optical signal, the error signal, and the tracking error signal detected by the optical pickup device 3 from the light emitted from the optical disc 2. Control signal: The two-axis actuator of the optical pickup device 3 is driven by the objective lens 1 () 5 to be located in the focusing direction and the tracking direction. The emitted light passes through the objective lens U) 5 and the person focuses on the disc 2 Required recording track. Then, the optical disc device i borrows a cracking adjustment circuit 12 and an error correction circuit 13 to perform demodulation processing and error correction processing on the signal read by the optical pickup device 3, and then generates a signal from itself. The optical path of the emitted light and the returned light in the optical pickup device 3 having the above-mentioned optical system 120 will be described below with reference to the drawings. When the optical disc device 1 reproduces information from the recording surface 2a of the optical disc 2, as shown in FIG. 22, the light emitted from the light source 101 is divided into three beams including 0th order light and 1st order light by a diffraction grating. . The emitted light divided into 3 beams is reflected by the first surface 123a with a 3 beam splitting of 123, and is condensed into a specific numerical aperture by the opening aperture 104, and is condensed by the objective lens 05. On the recording surface of the disc 2-50-1227884 2 &. The light returned from the recording surface 2a of the optical disc 2 is refracted by the first surface of the beam splitter ΐ23 and passes through the beam splitter 123, is reflected by the second surface coffee, and is emitted in a different area from the incident area of the first surface 123a. The astigmatism is corrected and transmitted in the middle, and the reflected light corresponding to the 0th order light divided by the diffraction grating 102 is incident on the apex angle of the division φH). The reflected light incident on the apex of the regular quadrangular pyramid of the division 稜鏡 106 is refracted in different directions by being incident on the peripheral surfaces of the regular quadrangular pyramid, respectively, and is divided into four reflected light. Each light-receiving area of the main beam photodetector irradiated on the receiving part & 3, I. In addition, # one of the ± 1st-order light split by the diffraction grating 102 and transmitted back through the beam splitter 123 should be irradiated to each light receiving area e3 of the side beam photodetector 112 of the light receiving unit 107 , f3, and the other sides are respectively irradiated to the respective light receiving areas of the photodetector "3" for the side beams of the light receiving unit 107 ^. The optical pickup device 3 having the optical system 120 configured as above can appropriately correct the astigmatism amount by a diffractive element provided in the emission area of the first surface 123a of the beam splitter 123, and can be divided by 稜鏡 106. Since the reflected light is divided into # portions, the returned light can be appropriately guided to each light receiving area of the light receiving section 107. Next, as shown in FIG. 26, the optical pickup device 3 of the third example includes: an optical system 13o that reproduces information from the optical disc 2; and the figure i that the optical system 13o has a driving displacement of the objective lens described later is not shown. # 'S lens drive mechanism. Hereinafter, the optical pickup device 3 having the optical U 13G will be described, but the structure common to the optical pickup device 3 having the optical stem r, ′, and the charge 100 will be denoted by common symbols and detailed description thereof will be omitted. The optical system 130 of the optical pickup device 3 has the following order of light path: light -51-1227884 source 1 Ο 1 ', which emits laser light onto the optical disc 2; a diffraction grating 丨 〇2, which will be from the far light source 1 0 The emitted light from 1 is divided into 3 parts; the beam splitter 丨 3, which separates the optical path of the emitted light divided into 3 parts from the diffraction grating 1 and the light path reflected from the optical disc 2; opening aperture 1〇 4. It is a record of condensing the output light separated by the beam splitter 133 into a specific numerical aperture Nα; for the objective lens 105, it records the light condensed by the opening aperture 104 on the record of the optical disc 2. On the surface; Fen Wu 106, which is to divide the light returned from the optical disc 2 through the beam splitter 133 into 1J into 4 parts, and the Ministry of Culture and Light, 07, which accepts being divided. 〇6 separated back into the light. The beam splitter 133 includes: a first surface 133a; a parallel first surface 133b to the first surface 133 &, between the first surface 133 & and the second surface ^, the optical axis of the emitted light is only inclined to be specific A third surface 133c at an angle; a fourth surface 133d orthogonal to the first surface i3h and the second surface 133b; and a fifth surface 133e substantially parallel to the third surface U3c are light-transmitting members. The beam splitter 133 is arranged in such a manner that the first surface and the second surface 133b pair the light emitted from the light source 101 is orthogonal to each other, so that the light emitted from the light source passes through the first surface 133 & and is reflected by the third surface 133c. And guide the second side of the disc 2 through the fourth side 13301, and make the reflected light reflected by the disc 2 pass through the fourth side U3d and the third side, reflect on the fifth side, and pass through the first side. Shoot the area and lead to the segmentation 稜鏡 106. The fifth surface 133 of the beam splitter 133 is formed by e to form a total reflection surface by evaporating a reflection film or the like, and the fifth surface 133e is totally reflected and reflects light as ′. The beam splitter 133 allows only a certain amount of astigmatism to pass through the light returned from the mirror 2 of the optical disc 106, and is incident on the splitting edge beam splitter 1 3 3 by adjusting the -52-1227884 to the light source. The position of the direction of the optical axis of the emitted light emitted by 101 can ^ adjust the defocus of the pair of optical discs 2. 4Easy adjustment On this third inch, a third reflecting surface 133C of the beam splitter 133 is provided with a semi-reflecting mirror surface that reflects the light emitted from the light source and transmits the light returned from the optical disc 2. Outside the 1 beam, the first side 1333 of the beam splitter 133 is shot back from the disc 2 ~ The QSR is equipped with a diffraction element that corrects the astigmatism of the light returned from the disc 2 in the psr field. 1 33 The amount of astigmatism of the returned light is suitable for focus adjustment. . Such a diffraction element can also be treated with a specific holographic pattern by etching. The second element:… When the holographic element is used, it should be a surface relief: a hologram, or a holographic hologram to improve the diffraction efficiency. . As shown in FIG. 20 and FIG. 21, the split prism 10 is formed into a roughly positive four corners, and the center of the returned light that passes through the beam splitter 133 is near the focal point, and the center of the returned light is projected on the top of the regular quadrangular pyramid. Corner center configuration

The mirror ⑽ is located on the optical path of the returned light passing through the beam splitter 133, and ㈣ = the light is divided into 4 parts. U The optical disc is equipped with the optical pickup device 3 having the above-mentioned optical system 130. According to the optical pickup device 3 detecting the light beam from the optical disc 2 and the error signal == Γ, the control signal is output from the servo circuit 10. The two-axis actuators to and are respectively driven by the objective lens 105-located in the * focus direction and the tracking direction, and the emitted light passes through the objective lens to converge on the required recording track of the EOM 2. The optical disc device i uses the signal demodulation packet 12 and the error correction circuit 13 to perform demodulation processing and error correction processing on the optical pickup device% read, and then reproduces the signal from the center wheel. Below, Mai according to the schematic description has the above Optical path of the optical pickup 13-1271-2884 in the optical system 13. Record of optical disc device 1 from optical disc 2-. When the recording surface 2a is regenerated, as shown in FIG. 26, the radiation emitted from the light source 1 〇ΦΦ & Μ ό L τ is divided by the diffraction grating 1 〇2 into 0 light and soil. 3 shots of 1 light.妯 八 * 丨 >, / The light emitted by the knife brake into three beams passes through the first surface 133a of the beam splitter 133, and is reflected by Chu: r κ, the second surface 133c, and continues to pass through the fourth surface 133d, The opening aperture ι04 is used to make a 4 inch diameter numerical aperture, and the light is focused on the recording surface of the optical disc 2 by the objective lens 105. The light returned from the recording surface 2a of the optical disc 2 passes through the fourth surface ⑽ and the third surface 133 of the beam splitter ⑴. Reflected by the fifth plane, and compensate for the astigmatism 1 and transmit through an emission area different from the incident area of the first plane ⑴ &, corresponding to the 0th order of light divided by the diffraction grating 102 The reflected light is incident on the apex of the segmented ridge. The reflected light incident on the apex of the regular quadrangular pyramid of the division 稜鏡 106 is refracted in different directions by being incident on the peripheral surface of the Sakaioka Ikii I valley of the regular quadrangular pyramid, respectively, and is divided into four shots. Return light, and the respective light receiving areas a3, b3, e3, d3 of the main beam photodetector 111 which are irradiated to the light receiving unit 107 in the eighth direction, respectively. Corresponds to the + 1th order divided by the diffraction grating 1 ο 2 and the reflected light transmitted through the beam splitter 133 by the person 9 is irradiated with the light for the side beams of the light receiving section 1〇 ^ 1 υ / Each of the light receiving areas e, f of the detector 112 is not known to the light receiving areas g3, ^ of the side beam photodetector 113 for the light beams 107. The optical pickup device 3 having the above-structured optical system 130 can be set in the emission E η of the first surface 133a of the beam splitter 133, and the diffraction element in the & domain can be appropriately corrected to correct the astigmatism amount. Since the reflected light is divided into four parts by the division 稜鏡 106, the returned light can be appropriately guided to each light-receiving area of the light-receiving part i 〇7. Next, as shown in FIG. 27, the optical pickup device 3 of the fourth example includes: an optical system 14o that reproduces information from the light-54-1227884 disc 2; and the optical system 14o is provided with an objective lens drive displacement described later The lens driving mechanism is not shown in the figure. Hereinafter, the optical pickup device 3 having the optical system 140 will be described. However, the structure common to the optical pickup device 3 having the optical system 100 will be denoted by a common symbol and its detailed description will be omitted. The optical system of the optical pickup device 3 has the following optical path order: the light source 1 0 1 ', which emits laser light onto the optical disc 2; the diffraction grating 1 2, which is emitted from the light source 1 0 1 The emitted light is divided into 3 parts; the beam splitter 丨 43 is used to separate the optical path of the emitted light divided into 3 parts by the diffraction grating 102 and the light returned from the optical disc 2; The output light separated by the beam splitter i 43 is condensed into a specific numerical aperture NA; for the objective lens 105, the output light condensed by the aperture stop 104 is condensed on the recording surface 2 of the disc 2 &;Upper; segmentation unit 106, which divides the light returned from the optical disc 2 through the beam splitter 143 into four parts, and the light receiving unit 107, which accepts the division by the division unit 〇〇〇6 The shot back into the light. The beam splitter 143 includes: a first surface 143a; a second surface 143b perpendicular to the first surface 143 & and a third surface 143c connected to the first surface 143a and the second surface 143b to form a roughly isosceles triangle A light-transmitting member with a rough triangular prism shape. The beam splitting state 143 reflects the emitted light from the light source 101 to the side of the optical disc 2 with the first surface 143a, and reflects the reflected light reflected by the optical disc 2 through the first surface 143a, reflects on the third surface 143c, and transmits through the first surface 143c. Dihedral 143] 3 and leading to segmentation 稜鏡 106. The third surface 14; 3C of the beam splitter 143 forms a total reflection surface, and the third surface 143c is formed by, for example, a vapor-bonding reflective film, and the total reflection reflects light. The beam splitter 143 passes the light reflected from the optical disc 2 and only a certain amount of astigmatism is incident on the light returned to the center of the dividing edge -55-1227884. Beam splitting The position of the optical axis direction of the light emitted from the light source 整 is adjusted by adjusting the defocus of the optical disc 2 by mistake. J # 易 调 At the moment, the beam splitter 141, the second brother of M3 who ca n’t fly, is equipped with a reflected light from the 143a, and the self-disc 9 is the same as the original 〇1. Outside of the semi-reflective transmitted light, the second surface 14313 of the beam splitter 143 is. This & upper 5 has a diffractive element that corrects the astigmatism amount of the small umbrella that is returned from the optical disc 2, and the image of the returned light through the beam splitter 143 is suitable for focus adjustment. Such diffractive elements can also be smashed by processing specific holograms, which can be inserted from the ^ Putian Etching Site to form the Wang Xiwu pieces. The holographic element should be a surface relief hologram, and its radiation efficiency. 〇I In order to flash the hologram to improve the winding. As shown in Figure 20 and Figure M, the segmentation is clear into a roughly regular quadrangular shape, and the beam passes through the beam splitter 143, and the cone is opened. 4 The focal point or near the focal point is arranged such that the center of the reflected light is incident on a square pyramid ^ ^ Μ «卞 ~. The division prism 106 is located through the beam splitter 143 and divides the light into four parts. On the ^, ya installed the optical disc of the optical pickup device 3 of the optical system 140 that was put back on the disk. "ΤΛ 二 置 3 The focus is determined by the light emitted from the optical disc 2 and the tracking error #blind and track the wrong position. The bismuth optical pickup device 1G outputs a control signal to the material, an axis actuator, which is driven by the objective lens 105 to be located in the focusing direction and the soil self-jealousy & 6 隹 ... direction, the emitted light passes through the alignment The objective lens 105 is combined with the required recording optical disc device 1 for the optical disc 2. The signal demodulates the private path 12 and the error correction signal ^ ^ Package 13 includes the signal read by the pre-learning pickup device 3. After the demodulation processing and error processing, the reproduction signal is output from the interface 14. -56-! 227884 or less, the following description will explain the emitted light and radiation in the optical pickup device 3 with the optical system 140 described above. The optical path of the returning light. When the disc I is set 1 to reproduce information from the recording surface 2a of the disc 2, as shown in FIG. 26, the emitted light emitted from the light source 1 0 1 is divided by the diffraction grating into 0 light and ± 3 beams of primary light. The emitted light divided into 3 beams is reflected by the -plane 143a of the beam splitter 143 Condensing to a special numerical aperture through the opening aperture 104 and focusing on the recording surface 2 & of the optical disc 2 with the objective lens 105. The light emitted from the recording surface 2a of the optical disc 2 The first surface 143 ″ transmitted through the beam splitter 143 is reflected by the third surface 143c, and the astigmatism sub-transmission is corrected in the second surface 143b, corresponding to the 0th order of the light divided by the diffraction grating 102. The returning light is incident on the apex angle of the division 稜鏡 106. The incident return light incident on the apex angle of the regular quadrangular pyramid of the division 稜鏡 106 is refracted in different directions by the individual shots on the peripheral surfaces of the regular quadrangular pyramid, and It is divided into four pieces of reflected light and irradiated respectively. The light receiving areas a3, b3, and 'eg' of the main beam detector 111 for the main beam 107 are respectively. In addition, they correspond to the diffraction grating 1〇 2 of the divided soil 3 times of primary light One side of the reflected light transmitted through the beam splitter 143 is irradiated on the side of the light receiving section ι07 and irradiates the light receiving areas e3 and f3 of the detector m, and the other is irradiated on Each light-receiving area of the side-beam photodetector 113 of the fork light unit 107 has an optical pickup of "h" having the optical system 14 configured as above. The fetching device 3 can appropriately correct the astigmatism amount by a diffractive element provided in the emission area of the first surface 143a of the beam splitting state 143, and can split the incident light into four parts by the division 稜鏡 106. The returned light can be appropriately guided to each light receiving area of the light receiving section 107. -57- 1227884 As described above, the optical pickup device 3 with the first disc device is equipped with the optical pickup device 3 shown by the light. Therefore, the burial of ^ m 'or 140 will cause the focus error signal FE and tracking error. The signal te driving variable is located on the poly-square: the driving mechanism 'aligns the objective lens I. 5 Respectively, the direction and the tracking direction, so that the emitted light is focused on the recorded surface 3 of disc 2 to reproduce the information from disc 2. , 123 ^ "The optical pickup device 3 with disc 1 set 1 can use the beam splitter 103 light, because ^ '134 corrects the two shots returned from the disc 2 in an appropriate amount of astigmatism. This can control the beam point Deformation of the shape makes it possible to shoot back to I: thus improving the reliability of the focus error signal. The same optical pickup device 3 can be used in combination with the previous optical pickup device, which can reduce the manufacturing cost, and expand the optical element < degree of freedom of disposition, communication > and the design of the optical system. Set = by the light: as shown in Figure 19 and Figure Λ1, the main prism 9 splits the light returned from the disc 2 with H by the main beam 9 and cuts it back with Γ. A3, b, prism division method, set the light receiving area of the main beam photodetector 107 ===================================================================================================================================================== ′ ’’ ’’ ’than the position of the blade of the main-beam detector for light beam to be relaxed at a specific size Required precision. Therefore, the optical disc device can reduce the f # of the optical pickup detector 107, and the main beam light k can be easily " " focused on the position of the beam-receiving light detector 107 in the manufacturing step of the pickup device 3. Wrong signal, reliability. Set it for 3 weeks, you can get the -58- 1227884 obtained. In addition, the optical disc device 1 can also form the above-mentioned split prism 10 as an octagonal pyramid. In this case, the main beam photodetector 光 of the light-receiving section 107 may be configured by being divided into eight parts by a dividing line which is radiating from the center of the light-receiving surface. The split ridge 106 is not limited to a pyramid having a flat surface, and may be formed into a shape having a plurality of curved surfaces. In this case, it is provided so as to correspond to the divided area of the main beam photodetector lu of the light receiving unit 107. The optical disc I can be set to 1 on a light-transmitting member having a roughly flat plate shape. As a holistic element, a specific holographic pattern is processed by # engraving to form a division 稜鏡 10 king 6. Besides A, when a hologram element is used, it should be a surface relief type hologram or a sparkle hologram to improve diffraction efficiency. Further, as shown in FIG. 16, the optical disc device 1 can obtain the same effect by using a grating 79 divided into four regions instead of the division chirp 106. In this case, in order to obtain the same effect as that of the division 稜鏡 106, the grating 79 is provided with divided regions yi, y2, and y4, and the direction of forming grooves in each of the divided regions yi, hh is different. Specifically, the direction of the grooves forming the divided areas ^ ^ and y 3 and the direction of the grooves forming the divided areas y 2 and ^ are orthogonal to each other. The grating 79 diffracts and divides the light returned by the incident disc 2 into four parts according to the groove directions and grating constants of the divided areas yi, and y4, and guides the light detector 111 for the main beam of the light receiving section 107. . The grating 79 is formed as a hologram element by etching a special hologram pattern. In addition, when a holographic element is used, a surface relief type hologram is preferred, or a blaze hologram may be used to improve diffraction efficiency. The optical disc device 1 can also be designed to have a reflective surface in the optical path, so that by using the reflective surface, the degree of freedom in optical design can be improved by bending the optical path. -59- 1227884 The light that is reflected back into the disc device 1 causes the self-disc 2 that is incident on the division 稜鏡 10 6, that is, 45 for each side of the division 稜鏡. Hereinafter, the inclination angle of each face of 稜鏡 106 forms 45. The following two ways to enter the total reflection conditions can increase the refraction angle, = the eighty-two-point interval within the photodetector 'can expand the side of the 111 disc for the main beam μ s knife interval and the photodetector for the main beam The interval between the light detectors 112 and 113 for the beam-strength and beam can relax the combined precision of the light extraction device 3. You Yucai Mistake # 2: Two optical discs are placed in the optical pickup device 3 to obtain focus 3 13 & FE, which uses the so-called astigmatism method, but it is also possible to use the Foucault method and other methods to estimate. The optical disc device 1 uses the so-called grinding method to obtain the tracking error signal in the optical pickup device 3, but other detection methods such as the (differential phase detection) method may be used. The structure of the optical disc set 1 is in the optical pickup device 3 described above, and the elements for correcting the image are set on the light exit surface of the beam splitter 103, 123, 133, 134, but it is also possible Set in another location. The position of the component that sets the astigmatism correction amount should be the incident or outgoing surface of the returning light divided by 稜鏡 106. Furthermore, the 'optical disc device 1 uses a correction astigmatism element as a diffractive element in the optical pickup device 3', but it is not limited to this, and a cylindrical surface may be provided. In the above example, the structure and operation of the optical pickup device 3 when the optical systems 30 and 60 are corrected with the optical path variation and the optical systems 100, 120, 130, and 140 with the corrected astigmatism are explained. It is also possible to have an optical system that corrects the optical path variation and corrects the amount of astigmatism. -60- 1227884 ♦: The following is a description of a structural example of an optical pickup device 3 having a light μ system that corrects for optical path variation and astigmatism. In addition, the first fish and the optical system6. Optical pickup equipment. Common structure: then bluff, and its detailed description is omitted. . α 己 /, using = the optical system 15 of the pick-up device 3, as shown in the paragraph: the sequence has: the light source 6, which emits laser light onto the optical disc 2 ... the pre-element 151, which is a part of Baobao since now # ，， 口 口 光 2. The light emitted by the knife from 3Hai Xianyuan 61 will separate the light from the well and the light from the light, and further ', shoot Θ 氺 · calling, the first one to separate the light from the mouth, open Aperture 33, which is the light beam # + from the light source 6 and the element 151, is transmitted through the combined light 34, and the numerical value of the aperture hole is aimed at the object lens :: The emitted light is condensed on the record ^ a 'of the optical disc 2 and the * light portion 152, which receives the light emitted from the optical disc 2. Pioneer 61 is a semiconductor laser with a self-emissive point ... that emits light at a wavelength. The m-field shot / picture block As shown in FIG. 29, the composite optical element 151 is formed into a block shape by ejecting a molded tree moon material, and has a light source 61 of k, and the light point of the fish since ancient mysterious light source 61 61a shoots 1 °, the first side 1 53 of the straight father of the light axis, and the brother's side! 53 parallel opposite second surface 154; oblique at a specific angle and the opposite -s Μ 4 are ... hit I brother two faces 1 5 5 and oblique Sheng I 1 rβ »丄 士 and opponent face 153 and second face 'and The third surface 155 is only inclined at a specific angle, and the fourth surface 15 6 ° is 82%. There is a sigh on the light emitting point from the light source 61. The light emitted by the light source does not include 0 times of light and + ? ^, The first diffraction grating 161 of the first two beams. In order to obtain tracking error information, the predecessor system 150 applies a so-called request method -61-1227884 1 and constitutes a tracking servo by receiving the secondary light divided by the first diffraction grating 6m by the light receiving unit 152 and performing tracking servo. The second surface 154 is provided with a second diffraction grating 162, which is to diffract the 0th and ± 1th light divided by the first diffraction grating 161 of the light returned from the optical disc]. These are divided into 0th order light and ± 1st order light. If the + 1st order light is used as the return light and the light path of the emitted light is separated. The third surface 155 is provided with a holographic element 163, which is located on the optical path of the reflected light separated by the second diffraction grating 162, so that the reflected light is reflected and diffracted, further divided into 0 times of light And ± 1st order light, if the _ 丨 th order light is used as the reflected light to correct the optical path variation generated by the second diffraction grating 162, the astigmatism amount is further corrected. The hologram element 163 is provided with a specific reflection film on the third surface 155 in such a manner that the incident reflected light is totally reflected, and functions as a so-called reflective hologram element. The hologram element 163 is formed by etching a specific hologram pattern. When the hologram element 163 is used, it is preferably a surface relief type hologram or a blazed hologram to improve the diffraction efficiency. The fourth face 156 is provided with a division 稜鏡 164, which corrects the optical path variation by the hologram element 163 and is located on the optical path of the reflected light 'and divides the returned light into 4 parts. As shown in FIG. 30 and FIG. 31, the segmentation 稜鏡 164 is formed into a roughly regular quadrangular pyramid shape, and the _order light reflected and diffracted by the holographic element 163 is near or near the focal point of the diffracted light. The center of the incident light is arranged so as to be incident on the center of the vertex of the regular quadrangular pyramid. The division ridge 164 is located inside the composite optical element 151, and is arranged on the inside side toward the vertex angle. That is, the segmentation 稜鏡] 64 is diffracted by the first diffraction light thumb-62-1227884 ——the 0th order light of the beam is diffracted by the second diffraction grating 162, and reflected and diffracted by the whole Z-piece 163, It is configured to be incident on the top corner. In addition, 稜鏡 164 is arranged so that the bottom face of the regular quadrangular pyramid is orthogonal to the optical axis of the -1st-order light reflected and injected by the hologram element ⑹. The composite optical element 151 uses the reflected light separated by the second diffracted light peach 162 to pass through: only a certain amount of image is placed on the reflected light incident on the divided light 164 and the combined optical element 151 is adjusted by The position of the light source in the direction of the optical axis of the emitted light can easily adjust the defocus of the optical disc 2. It is not limited to resin materials, and optical materials such as glass materials that have translucency can also be used. The material structure can be locally changed by the combination of the learned materials. The composite optical element 151 is formed by injection molding of a resin material. Other forming methods can also be formed by the first diffraction grating 16 ^ and the second through the etching process. The diffraction grating 162, the holographic element 163, and the division 稜鏡 164 can also be formed by machining. In addition, the material forming the composite optical element 丨 5 丨 At this time, the composite optical element 151 and the composite optical element 32 and the composite optical element In the same way as explained in 62, the composite optical element 151 can be designed by calculating the grating constants of the second diffraction grating 162 and the hologram element 163 and the angle formed by the third surface 155 and the second surface 154, which can be corrected. The optical path of the reflected light is changed by the wavelength change, and the returned light is correctly guided to the vertex of the division prism 164. In addition, the composite optical element 151 is the same as that described in the above-mentioned optical system 100, 120, 301, and 140. On the ground, the holographic element 1 67 provided on the third surface 155 can be used to correct the amount of astigmatism on the focus servo. The composite optical element 151 thus designed is -63 emitted from the light source 61 -1227884 When the wavelength of the emitted light changes, the light returned from the disc 2 is diffracted by the second diffraction grating i62 into +1 order light and separated from the emitted light, even if the optical path of the separated reflected light changes, The reflected light is reflected and diffracted by the hologram element 163. The human light always guides the light returned from the optical disc 2 to the top corner of the division 64, and each of the divided lights divided by the division 164 can be reflected back. Correctly guide the light receiving section 1 5 2 to a specific position in the light receiving area. The aperture stop 33 is disposed on the optical axis of light emitted through the second diffraction grating 162 of the composite optical element i5i. The objective lens 34 is composed of at least one convex lens, and focuses the light emitted from the light source 61 and condensed by the aperture stop 33 on the optical disc 2. As shown in FIG. 32, the light receiving unit 152 has a roughly square main beam photodetector i7i for receiving the main beam of the 0th-order light divided by the first diffracted light thumb and the first diffraction of the beam break. One of the two side beams of ± 1 order light divided by the grating 161-a group of roughly square side beams is inspected with light ❹172,! 73. The light-receiving beam 152 is arranged at a position corresponding to each of the reflected light beams which are divided by the division beam 稜鏡 of the composite optical element 151. The light-receiving unit 152 is provided with a central square-shaped photodetector m for the main beam, and is provided with a set of rough squares V on both sides of the photodetector 171 sandwiched therebetween. Photodetectors 1 72, 1 73 for side beams. The photodetector 171 for the main beam of the light section 152 has light receiving regions which are divided into four equal parts by the line dividing line and the line dividing line. Each light-receiving area a, h ”44 d4, eight M 4 b4, C4, and d4 are respectively irradiated with divided 稜鏡 164 as a sub-component of each of the four parts -64-1227884 Light section 1 52 side shot away & ία »Σσ w is the first detectors 1 72 and 1 73 for capsules, which respectively have a light receiving area w f4 divided by a dividing line into two and a light receiving area A 4 and a light receiving area e 4, respectively. The internal irradiation corresponds to the part of the light divided by the first diffraction grating i6i, q, which is low, and the light returned from the optical disc 2 is in the center of each light receiving area, and the radiation corresponds to the soil divided by the first diffraction grating 161. 1 time of the light from the other side of the disc 2. The lens driving mechanism of the optical pickup device 3 includes a lens holder holding the objective lens M, and the lens holder supporting the lens holder can track in a focusing direction parallel to the optical axis of the objective lens and perpendicular to the optical axis of the objective lens 34. The direction of the force axis is the upper bracket support member; and the electromagnetic drive makes the lens holder drive to be located in the two-axis direction by electromagnetic force, but the figure does not show y | \ 〇, the lens drive mechanism is based on the light receiving unit 152 The main beam photodetector i7i detects the focus error signal and the side beam photodetectors 172 and 173 detect the tracking error signals, respectively, so that the objective lens 34 is driven in the focus direction and the tracking direction, so that The emitted light is focused on the recording surface of the recording disc 2 of the recording track. In addition, the above-mentioned division of the composite optical element 1 51 can be formed. 1 64 can also be formed. In this case, the main light of the light department 1 5 2 The beam photodetector 1 7 1 can be constructed by dividing X into 8 parts by means of a radial dividing line from the center of the light surface of the document. In addition, the division i 5 of the composite optical element 稜鏡 【Ｍ 系 对 四The surface 156 is provided on the inner side, The fourth surface 156 may also be protrudingly disposed on the side. Furthermore, the division of the composite optical element 151 1 稜鏡 1 6 4 is not limited to having a flat pyramid, and may be formed into a shape having several curved surfaces. In this case- In the case of 65-1227884, it is set to correspond to the divided area of the main beam photodetector 171 of the light receiving section 152. In addition, the composite optical element 151 can also be obtained by firstly dividing the first diffraction grating 1 6 1 and the first The two diffraction gratings 1 to 62 are respectively formed as holographic elements, and the specific holographic patterns are engraved and processed. In the case of using the holographic elements, the surface relief type hologram may be used, and the hologram may also be shined to improve the diffraction efficiency. Compound As shown in FIG. 16, the optical element 151 uses the grating 79 divided into four regions instead of the division 稜鏡 164, and the same effect can be obtained. At this time, the grating 79 is provided to obtain the same effect as the division 稜鏡 164. The direction in which the grooves are formed in the divided areas, hh, each of the divided areas yi, y2, and ^ are different. Specifically, §, the direction in which the divided area y! Is formed and the direction in which the grooves in the divided areas y2 and h are formed are related to each other. Orthogonal. Grating 79 Should be divided into regions) M, h, that is, the groove directions and grating constants of y4 diffract the light returned by the incident disc 2 and divide it into four parts, and guide the main beam photodetector 171 to the light receiving part 152 The grating 79 is formed by etching a specific holographic pattern as a holographic element. In addition, when a holographic element is used, it should be a surface relief type hologram or a sparkle hologram to improve diffraction efficiency. The composite optical element 1 5 1 can also be designed to have a reflective surface inside. In this way, by using the reflective surface, the degree of freedom in optical design can be increased by two times by bending the optical path. Furthermore, since the composite optical element 151 makes incident on the dividing edge The incident angle of the light returned from the mirror 164 by the optical disc 2 is equal to or less than 4 5 for each of the faces of the division 稜鏡 1 64 ′, that is, the inclination angle of each face of the division 稜鏡 1 6 4 is formed to be 4 5. In the following, -66-1227884 to avoid the incident angle of radiation, so the way of T-eight external parts can increase the angle of refraction, so the separation of the beam points of the returned light can be separated.垆 Female lead beam detection with light detection 171 h J Extend the interval between the divided regions and the main body ten strike field photodetector 171 and the side beam using the pair of light detection light detection as 1 7 2, 1 7 λ Evening M us wide optical pickup device 3 ^ ^ 173 interval, can put the combined precision of% clothing 3. Equipped with a set of 1 and a non-learning pick-up device 3 with a charging capacity of 1, 50, as well as a pre-disc installation error signal and tracking from the optical disc 2 and the door 1%. Focusing of the optical pickup device 3 detected by the optical pickup device 3 = two since: the service circuit ___ is located in the focusing direction and tracking °. : It is driven by the objective lens 34 to change to the direction of the second disc, and the emitted light is focused on the recording path through the objective lens 34. Then, the optical disc device is solved by Γ, the demodulation circuit 12 and the grandfather ~ γ + '罝 1, and the error is solved by 13. The number read by the optical pickup device 3 is subjected to unblocking processing and an erroneous order signal. From) 丨 surface 14 output regeneration is reduced, "the optical pickup device 1 with the above-mentioned optical system 150 of the optical pick-up and wear 3, is shown in Figure 1-Ha Shang Ke Yu ^ mouth take clothes set 3 ... ,,, pattern The optical path length of the return light in the optical pickup device 3 is shown. As shown in FIG. 28, the light output and emission are from the optical disc device. The first hunting is made by the 一 μ grating of the combined optical element 151, which is divided into Baodi 1 and 3 beams. The emitted light is transmitted through the composite optical lens = skin segmentation 162 'Sub-focused on the disc by the objective lens 34 The center of the recording surface of 2: the first grating is from the recording surface of the disc 2 to the second diffraction grating, and the diffraction grating is introduced and directed toward the third surface H ;; the first of the 151 is called the first, + J times -67- 1227884 Light is incident on the holographic element 丨 63. The +1 order light incident on the holographic element 163 from the second diffraction grating 162 is reflected and diffracted by the holographic element 163, and the secondary light is incident on the top angle of the division 稜鏡 164 . At this time, in the hologram element 163, the optical path change of the +1 order from the second diffraction grating 1 62 due to the second diffraction grating 1 62 is changed and the astigmatism amount is corrected. The -1 times of light incident on the apex of the regular quadrangular pyramid of the divided 稜鏡 164 are refracted in the same direction by incident on the peripheral surfaces of the regular quadrangular pyramid, respectively, and are divided into 4㈣returned light, which are respectively irradiated on Each light-receiving area h of the photodetector m for the main beam of the light receiving IU52, d4 0 diffracted light diffracted by the hologram element 163 is incident on the top angle of the division 稜鏡 164, as shown in FIG. 33A, the objective lens 34 and the optical disc When the recording surface 2a of 2 is located at the in-focus position, a person who shoots on the top corner of 'Segment 稜鏡 16 4 has a roughly circular shot-In addition, when the diffracted light is incident on the top corner of Segment 稜鏡 164, as shown in Figure Μ • When the objective lens 34 and the recording surface 2a of the optical disc 2 are too close, the objective lens 34 deviates from the in-focus position. Therefore, 'the astigmatism caused by the diffracted light passing through the composite optical element 151 is at the top angle of the division 164' The incident light has a long axis forming an elliptical diffracted light in the upper right of the figure. In addition, when the diffracted light is incident on the one-to-one W7 / j'object lens 34 when the recording distance from the disc 2 is too far away, the objective lens q deviates from the focal position. Therefore, the diffracted light passes through the composite optical element. " : The astigmatism generated is a long-axis elliptical diffracted light at the top corner of the division 稜鏡 164. Therefore, the diffracted light is in a state where the objective lens 34 deviates from the in-focus position ^. -68- 1227884 When shooting at the apex angle of the split prism 164, the two sets of peripheral surfaces X9 'Xll and the peripheral surface X10, Xl2 on the partition 164 are divided into incidents on the peripheral surfaces of a group Most of the diffracted light, and very little diffracted light is incident on the peripheral surfaces of the other group. That is, as shown in FIG. 33A, a diffraction prism having a circular diffracted light incident is formed, and the amount of diffracted light is large. Partially incident on a group of opposite peripheral surfaces ... ", and a small part of the diffracted light is incident on the -group of opposite peripheral centers. In addition, as shown in Fig. 33C, an elliptical diffracted light is divided into humans. Most of the 'diffracted light on the mirror' is incident on the peripheral surfaces of a group χ ... 2, A very small part of the light is incident on a set of opposite peripheral surfaces ... " The light returned from the optical disc 2 among the 0th light divided by the first-diffraction grating m is formed by being diffracted by the second diffraction grating 162 "Secondary light, by which] the secondary light is incident on each peripheral surface of the division i64 X9 'χι. 'χ ", h is refracted in different directions, so it is divided into 4 pieces of reflected light and incident on the light receiving areas of the main beam photodetector 171 of the light receiving section ΐ52, respectively. The two groups of light-receiving areas a4, e4 and the light-receiving areas of the main beam for the main beam are opposite to each other—the light-receiving areas of the group receive more light, and the light-receiving areas of the other group decrease . That is, when the elliptical diffracted light shown in FIG. 34A is incident on the division 稜鏡 164, as shown in FIG. 34A, the main-beam photodetector 171 has a larger amount of light received relative to each of the light receiving regions a ~ and Each light receiving area, ⑽: The amount of light in the text becomes less. When the elliptical diffracted light shown in FIG. 34C is incident on the split mirror 164, the photodetector m for the main beam is shown in FIG. ⑽, and the respective received light amounts of the -69-1227884 light receiving areas b4 and d4 are changed. And WC4 receives less light. The circular diffracted light shown in each of the ten light-receiving regions θ B is incident on the light detector 171 for the main beam of the division 稜鏡 1 6 4 person, as shown in FIG. 34B, and the opposite are: C4 and each light-receiving area b4, The light receiving amounts of d4 are equal. A 4-port photodetector 171 for this main beam is used in each light-receiving area, and each of the rounds detected by ′ d4 is &,%, & 2 The signal is calculated as shown in Equation 25 below. " Focus error " (25) FE — (Sa4 + Sc4)-(Sb4 + Sd4) The pre-detector 171 for the beam is positioned on the objective lens 34, and the recording surface 2a is located in the imitation—Ding Jiu Jiu Disc 2 of ... ， Position day guard, hunting the jealousy signal FE calculated by formula 25 is 0. The main shot Φ1 1 ® is used to measure the focus of the beam. The photodetector 1 71 is used to distance the objective lens 34 from the disc 2; if2: When the distance is too close, the focus error message is positive and the objective lens 34 is: . When the recorded surface 2a is too far, the focus error signal FE becomes negative. As described above, the photodetector 171 for the main beam of Xiangbendu eight w 邛 邛 152 is incident on each light receiving area ^ ^ ^ ^ ^ — 4 b4 '4, d4 output of each beam point And the dagger U, wrong # signal FE and obtain the reproduced signal. In addition, the light detectors 1 72, 1 73 of each beam of a group receive each of the light beams received by the grating H with the heart centered by the first diffraction grating 161 among the light beams returned from the optical disc 2. The amount of light received. Therefore, the side shots of the water receiving &

When it is Se4, Sf4, Sg4, Sh4, the tracking ^ TE can be calculated by the formula shown below. -70- (26) 1227884 TE- (Sa4 + Sc4)-(Sb4 + Sd4) -a ((Se4_Sf4) + (Sg4_Sh4)) The optical disc device 1 described above is based on an optical talent with an optical system of 15 The focus error signal and tracking error signal TE, which are lost by taking out 3, are controlled by the servo shaker 10, and the objective lens M is driven to be in the focus direction and tracking direction, respectively, so that the emitted light is focused on On the recording surface 2a of the optical disc 2, information is reproduced from the optical disc 2. As described above, the optical pickup device 3 having the optical system 150 of the optical disk device 1 has a composite optical element 151, which is provided with: a second diffraction grating 162 that diffracts light reflected from the optical disk 2; and The +1 order of light diffracted by the second diffracted light thumb 162 serves as the reflected light, and further diffracts the holographic 7G member 163 of the reflected light, even if the oscillation wavelength of the emitted light emitted from the light source is caused by the ambient temperature change. The change can still be guided to a proper position, and the astigmatism amount can be appropriately corrected by the hologram element 163. Therefore, the optical disc device, such as the composite optical element 151, uses an optical pickup device having a simple structure without increasing the number of parts, so that the reliability of the obtained focus error signal FE can be improved. Also, thanks to the disc device! The optical pickup device 3 having the optical system 15 is provided with only the composite optical element 151 to separate the emitted light and the returned light, and corrects the optical path variation caused by the wavelength variation of the emitted light emitted from the light source 61, and corrects the astigmatism amount. Therefore, the number of optical components can be kept to the minimum necessary, the structure of the optical system 15 can be simplified, and the manufacturing cost can be reduced. Thanks to the disc device! The optical system 15 in the optical pickup device 3 has -71-1227884 composite optical element 15b, which can improve productivity and reliability. 1 & Cost reduction The optical disc has an optical pickup optical element 151 shown in FIG. 28, and the composite optical element 151 has: 3: a division 稜鏡 164 with a light of 稷, and a dream…. The disc 2 shoots back the split beam g㈣ΛΉ, ... #The split line of the photodetector for beams. The form of the picking point is compared with the car, which is divided in the optical path to receive 4 split beams of 1 to 64. In the second method, each light receiving area a4 of the photodetector m is used: 4 C4 d4 for the main beam to ensure that the precision of the photodetector for the main beam can be seen at a specific large. The d-position temple requires that the optical disc device 1 can reduce the manufacturing cost of the optical beam measurement of the main beam of the optical pickup device 3, and in the manufacturing step of the optical pickup device 3: the optical detector for the main beam is easy to perform The position adjustment of 171 can improve the reliability of the obtained focus error signal FE. In addition, the optical disc I is set to 1 to obtain the focus error signal FE in the optical pickup device 3 described above. The so-called astigmatism method is used, but other detection methods such as ㈣ = can also be used. The optical disc device 1 does not easily constitute the element 4 of the composite optical element 15 as described above. Of course, by forming each optical element individually as an optical system with the same configuration as above, it is of course possible to obtain the same function. In addition, relevant industry players understand that the present invention is not limited to the above-mentioned embodiments described with reference to the drawings, and that various changes, substitutions, or equivalents can be made without departing from the scope and spirit of the patent application described below. -72- 1227884 Feasibility of industrial application: This Maoming's optical pickup device is used in an optical disk device. This composite optical element is used for optical pick-up and pick-up. Therefore, it can improve productivity and promote cost reduction. And improve the reliability of the dead N χκ focus error signal. Furthermore, 'the optical disc of the present invention uses the combined optical element for optical pick-up and placement', so it can be connected to Gu + Tai Yi to return to productivity, promote the reduction of manufacturing costs, and provide two focus error signals. reliability. When the optical device used in the optical pickup device of the present invention separates the light returned from the optical disc by the diffractive element, it corrects the optical path deviation caused by the wavelength change of the light emitted from the light source by the wavelength variation correction mechanism, The light can be appropriately guided to the X-ray mechanism, so the reliability of the focus error signal of the optical disc device can be improved. When the other optical device of the present invention separates the light returning from the optical disc from the light path of the emitted light, it is corrected to form an optimal astigmatism amount, so it can form a good guide of the light splitting mechanism. The shape of the light can therefore improve the reliability of the focus error signal of the optical disc device. The composite optical element of the present invention uses the composite optical element in an optical pickup device for an optical pickup device, so that productivity can be improved, manufacturing cost can be reduced, and reliability of a focus error signal can be improved. [Brief Description of the Drawings] The figure is a side view showing an optical system provided in a conventional optical pickup device. Fig. 2A to Fig. 2C show the beam points of each light receiving area of the main beam photodetector of the previous optical system. Fig. 2A shows the approach to the objective lens -73-1227884

The state of the disc. Figure 2B shows the state where the object is read by a μ person. The UI is only in the focus position. Β 2 is the state where the object lens is away from the disc. Fig. 3 is a state diagram of the central deviation of the light-receiving surface of the photodetector for the main beam of the first-gang optical system of the center of the "Don't shoot" # 止 不 "in the east point. Fig. 4 shows the optical disc of the present invention. Fig. 5 is a schematic view showing an optical system of an optical pickup device provided in an optical disc device. Fig. 6 is a perspective view of a composite optical element provided in an optical system of the optical pickup device. Fig. 7 is a view showing an optical device provided in the optical pickup device. An oblique view of the optical path of the returned light in the composite optical element of the optical system of the pickup device. Fig. 8 is an explanatory diagram of the optical path variation of the returned light in the composite optical element of the optical system of the optical pickup device. 9 is an explanatory diagram of a photodetector for a main beam and a photodetector for a side beam provided in a light receiving section of an optical system of an optical pickup device. Figs. 10A to 10C are views for a main beam provided in the optical pickup device. The beam spot of each light-receiving area of the photodetector. Figure 〇〇 shows the state of the objective lens close to the disc, Figure 10B shows the state of the objective lens in the focus position, Figure 10C shows the objective lens away from the disc State diagram. Fig. 11 is a schematic diagram showing another optical system of the optical pickup device provided in the optical disc plate. Fig. 12 is a perspective view of a composite optical element provided in the other optical system of the optical pickup device shown in Fig. 11. Fig. 13 is an oblique view of a division beam in a composite optical element of the other optical system-74-1227884 provided in the optical pickup device shown in FIG. 11. Observe the side of the incident surface of the retrieved light and set it in FIG. 11. Optical pickup, a divisional view of a composite optical element of another optical system. == Detector for the main beam and a side beam of 0 set in the other optical system of the optical pickup device shown in FIG. 11 An illustration using * detector. / Figure 16 is a light diagram that does not have the same function as the split optical element of the other optical system of the optical pickup device shown in Figure u. 丁 w Figure 1 7A to FIG. 7C show the diffracted ray of the divided light incident on the composite optical element of the optical pickup device shown in FIG. I 丨 FIG. 7A shows the state where the objective lens is close to the optical disc, and FIG. 17B shows The objective lens is in focus Figure 17C is a diagram showing the state where the objective lens is far from the optical disc. Figures 18A to 18C are beam points of each light receiving area of the main beam photodetector of the optical pickup device shown in Figure U Figure 18A shows the state where the objective lens is close to the disc, Figure 丨 8B shows the state where the objective lens is in the focus position, and Figure 18C shows the state where the objective lens is far away from the disc. Figure 19 shows the state of the optical disc device. A schematic diagram of another optical system of the optical pickup device. Fig. 20 is a perspective view illustrating a division frame provided in the other optical system of the optical pickup device shown in Fig. 19. Fig. 2 1 is an illustration provided in Fig. 19 A side view of a split frame in the other optical system of the optical pickup device shown in Fig. 22. Fig. 22 is provided in the other optical system of the optical pickup device shown in Fig. 19.

-75- 1227884 Description of main beam photodetector and side beam photodetector in the light receiving section of Fig. 0. Fig. 23A to Fig. 23C show that the composite optical element incident on the optical pickup device shown in Fig. 19 has For splitting the chirped light, FIG. 23A shows a state where the objective lens is close to the optical disc, FIG. 23B shows a state where the objective lens is located at a focusing position, and FIG. 23C shows a state where the objective lens is far from the disc. 24A to 24C show the beam points of each light-receiving area of the main beam photodetector provided in the optical pickup device shown in FIG. 19, and FIG.

Fig. 24B shows a state where the objective lens is close to the optical disc, and Fig. 24C shows a state where the objective lens is away from the optical disc. Fig. 25 is a schematic view showing another optical system of the optical pickup device provided in the optical disc device. Fig. 26 is a schematic view showing another optical system of the optical pickup device provided in the optical disc device. Fig. 27 is a schematic view showing another optical system in which the optical disc device is equipped with an optical pickup device.

Fig. 28 is a schematic view showing another optical system of the optical pickup device provided in the optical disc device. Figure 29 is a perspective view of a composite optical element of another optical system provided in the optical pickup device shown in Figure 28. Fig. 30 is a perspective view illustrating a division prism provided in a composite optical element of another optical system of the optical pickup device shown in Fig. 28; A divisional view provided in the optical pickup device shown in FIG. Figure 3 1 is the composite optics of other optical systems when viewed from the incident surface side of the self-reflecting light -76-1227884 Figure 3 2 is located in Figure 2 An explanatory diagram of the photodetector for the main beam and the detector for the side beam in the other optical system of the pickup device.

33A to 33C show the diffracted light incident on the split prism in the composite optical Tt element of the optical pickup device shown in FIG. 28, and FIG. 3A shows the state where the objective lens is close to the optical disc, and FIG. 33β shows the object FIG. 33C is a diagram showing a state where the objective lens is far away from the optical disc.

Figs. 34A to 34C show the beam points of each light receiving area of the main beam green detector for the optical pickup device shown in Fig. 28. Fig. M shows a state where the objective lens is close to the optical disc, and Fig. 34B shows Object penetration_in the state of the combination 'FIG. 34C is a diagram showing a state where the objective lens is far from the optical disc. [Schematic representation of symbols] 31

2,204 FE 6b 101, 211 212a 212b 33, 104, 214 ΝΑ 34, 105, 215 63, 107, 152, 216 Light-receiving integrated element Disc focus error signal light source Two-beam diffraction grating beam splitter Aperture aperture aperture numerical aperture to the objective lens light receiving part , Sc2,

Sd2, a3, b3, c3, d3, e3, f3, g3, h3, Sa3, Sb3, Sc3, Sd3, a4, b4, c4, d4, e4, f4, g4, h4 2a, 205

TE 1 3 4 5 6 7 8 9 10 11 12 13 14 30, 60, 100, 120, 130, 140, 201 32, 62, 151 ^ 212 41, 8b 103a, 123a, 133a, 143a, 153 Light receiving area I Recorded surface tracking error signal Optical disc device Optical pickup device Optical disc rotation drive mechanism Transmission mechanism control section Disc table spindle motor control circuit Servo circuit drive controller Signal demodulation circuit Error correction circuit Interface Optical system Composite optical element first side

-78- Second surface first—diffraction grating second diffraction grating third diffraction grating light detector for main beam side light detector for side beam light detector third surface fourth surface fifth surface first Light-shielding plate

1227884 42, 82, 103b, 123b, 133b, 143b, 154 45, 75, 161 46, 76, 162 47, 77 11 51, 91, 111, 171, 221 52, 53, 92, 93, 112, 113, 172 , 173 61a, 101a 83, 133c, 143c, 155 84, 133d, 156 133e 64 65 78, 106, 164 segmentation 稜鏡 79 grating yl, y2, y3, y4 segmentation area xl, x2, x3, x4, x5, x6 X7, x8, peripheral x9, xlO, xl1, xl2 102 Diffraction gratings 103, 123, 133, 143 Beamsplitters 163, 167 Hologram elements

-79-

Claims (1)

One by one * l ^ [227884; ί—j: ... L3_7 patent application Chinese · 'Cazolli scope replacement version (August 1993) Pick up, patent scope: L An optical pickup device, which has: A light source that emits light of a specific wavelength; an objective lens, which condenses the light emitted from the light source on the light and double-umbrella and a composite optical element that emits the light returned from the optical disc. : Diffraction element II ^ The light source emits the foot and the light is transmitted, and the light diffracted from the above-mentioned optical disc is diffracted, and the light-private interaction correction mechanism is configured for the returned light diffracted by the above-mentioned diffractive element The position where the person shoots, corrects the returned light to a specific position due to the emitted light emitted from the above-mentioned light source and the wavelength change causing the optical path of the return light produced by the above-mentioned diffractive element to change, and directs the returned light to a specific position; and 2. 4, 6. The light mechanism is a plurality of light-receiving regions that receive the reflected light after the light path change is corrected by the light path change correction mechanism. For example, the optical pickup device according to the scope of the patent application, wherein the above-mentioned diffractive element and the above-mentioned optical path variation correction mechanism of the composite = -piece are integrally formed by a resin material. &quot; The optical pickup device according to item 1 of the patent application range, wherein the above-mentioned diffraction element is a holographic element. = The optical pickup device of the scope of application for patent No. 1 wherein the above-mentioned optical path motion correction mechanism is another diffractive element and further diffracts the return light diffracted by the above diffractive element. '' The optical pickup device according to item 4 of the patent application, wherein the other diffractive elements are holographic elements. / 、 The optical pickup device according to item 4 of the patent application, wherein the above-mentioned composite 1227884 two elements further have a light splitting mechanism, which is configured to be incident on the incident light after the light-force correction mechanism corrects the change in the optical path. The positioner divides the incident light into a plurality of k-lights E that are directed to the light receiving mechanism. 7. 8. The optical pickup device according to item 6 of the patent application, wherein the diffractive element, the optical path variation correction mechanism, and the t-blade cutting mechanism of the composite optical element are integrally formed by a resin material. For example, the optical pickup device according to item 6 of the patent, wherein the above-mentioned light splitting mechanism is a prism formed by a plurality of planes or curved surfaces. For example, please apply to the optical pickup device of the eighth item of the patent, in which the above-mentioned composite light is provided to 7L pieces &lt; the above prism is formed into a substantially quadrangular pyramid shape, and the returned light after the above-mentioned optical path variation correction mechanism corrects the optical path variation is divided into Four parts ^ And the eighth light-receiving mechanism receives the light-receiving area that receives each of the light returned by the trowel of the composite optical element into 4 points, and is divided into * parts. 10. The optical pickup device according to item 8 of the scope of patent application, wherein the above-mentioned prism: the above-mentioned optical private change correction mechanism corrects the incident angle of the returned light after the optical path change is greater than 0. With 45 or less. between. U ′ is the optical pickup device according to item 丨 of the patent application range, wherein the reentrant optical element further has a reflection mechanism, which is based on the optical path of the light emitted from the light source 2Z, so that the emitted light is reflected on the diffraction element. And / or on the optical path of the returned light after being diffracted by the diffractive element, the reflected light is reflected at the specific position. 122 ^ 88¾ 12. If the center of the scope of the patent application is applied, it is particularly suitable for pick-up, and the above-mentioned compound is composed of several pieces <the upper diffraction element, the above-mentioned optical path change correction mechanism, and the upper reflection mechanism are integrally formed by resin material . The optical pickup device according to the scope of the patent, wherein the above-mentioned composite pre-arranged parts further have another diffraction element, which is arranged on the optical path between the light source and the diffraction element, and emits the light emitted from the light source. The light is divided into three parts: 0th order light and ± 1st order light. The light-receiving mechanism receives the 0th-order light segmented by the above-mentioned additional diffractive element among the returning light segmented by the light segmentation mechanism to obtain a focus error signal. And receive ± 1 times of light divided by the above-mentioned additional diffractive element to obtain a tracking error signal. M. For example, the optical pickup device of the 13th scope of the patent application, wherein the above-mentioned composite optical 7L piece "the above-mentioned diffractive element, the above-mentioned light The process change correction mechanism and the above-mentioned additional diffraction element are integrally formed by using a resin material. B The optical pickup device of item 13 in the scope of patent application, wherein the above-mentioned additional diffraction element is a hologram element. 16. If the scope of patent application is the first! The optical pickup device according to the above item, wherein the optical path variation correction mechanism corrects the astigmatism generated by the king in the optical path of the light beam emitted from the light source. 17. The optical pickup device according to item} of the application, further comprising a light-shielding mechanism, which is located between the light source and the diffraction element, and shields other than the effective light beam in the optical path of the emitted light from the light source. 18. The optical pickup device according to item i of the patent application scope, which further has an I227 | 8 # 20 light-shielding mechanism, which is located in the optical path of the returned light directed to a specific position by the above-mentioned optical path variation correction mechanism. Light beams other than the effective light beam are blocked. 19. An optical pickup device is characterized by having: a light source that emits light of a specific wavelength; a beam splitter that separates the light emitted from the light source and the light reflected by the phototherapy The optical path of the returning light, and the astigmatism is corrected in the optical path of the returning light. For the objective lens, it condenses the light emitted from the light source onto the optical disc, and returns the light from the optical disc. Light is condensed; a light splitting mechanism is disposed at a position where the reflected light separated by the beam splitter is incident, and splits the returned light into a plurality of light; and a light receiving mechanism It is used in several light-receiving areas to receive a number of reflected light divided by the above-mentioned light dividing mechanism; the above-mentioned light dividing mechanism is a prism composed of a plurality of planes or curved surfaces. The pick-up device, in which the prism is formed into a substantially quadrangular pyramid shape, and the returned light after the optical path change correction mechanism corrects the optical path change is divided into four parts. 21. The optical pickup device according to item 20 of the patent application scope, wherein The above prisms form incident angles of the returning light separated by the optical path separation element to each surface between greater than 0. and less than or equal to 45. 22. The optical pickup device according to item 19 of the patent application scope, wherein further A reflection mechanism is provided, which reflects the light emitted from the light path from the light source to the light path separation element and / or the light path of the return light separated by the light path separation element. , So that the reflected 1227884 light is reflected at the specific position. 2) The optical pickup device according to item 20 of the patent application scope, further comprising an additional diffractive element which is arranged on the optical path between the light source and the optical path separating element, and emits light emitted from the light source. Divided into three parts: 0th order light and ± 1st order light. 24. The optical pickup device according to item 19 of the scope of patent application, wherein the beam splitting state is formed into a substantially flat plate shape including a first surface and a second surface, and the light emitted from the light source is reflected by the first surface, and The returned light beam is transmitted through the first surface and the second surface at the same time. 25. The optical pickup device according to item 19 of the scope of application for a patent, wherein the beam splitting is formed into a substantially flat plate shape including a first surface and a second surface, and the light emitted from the light source is reflected by the first surface, and The reflected light is made incident from the first surface, reflected by the second surface, and transmitted through the first surface. 26. The optical pickup device according to item 19 of the scope of patent application, wherein the above-mentioned beam splitting strips / bags are formed by the "one side, the second side, and the second side", and the planes are formed into a general isosceles triangle shape. The reflected light emitted from the light source is reflected by the first surface, and the returned light is incident from the first surface, and transmitted through the third surface by the second-plane reflection. 27. The optical pickup device according to item 19 of the patent application scope, further including a light shielding mechanism, which is located between the light source and the beam splitter, and shields the effective light beam from the light path of the light emitted from the light source. Beam. 28. For example, the optical pickup device of item 19 in the scope of patent application, which further includes a light shielding mechanism, which is based on the light of the returned light separated by the beam splitter 122788 # 1- .. &gt; tl I Block light beams other than the effective beam. 29. An optical disk device comprising: an optical pickup device for recording and / or reproducing information on the optical disk; and an optical disk rotation drive mechanism 'which rotates and drives the optical disk; characterized in that: the optical pickup device has: a light source , Which emits light of a specific wavelength; an objective lens, which condenses the light emitted from the light source onto the optical disc, and condenses the light returned from the optical disc; a composite optical element, which has ·· diffraction element, which transmits the light emitted from the light source, and diffracts the light returned from the optical disc, and an optical path variation correction mechanism, which is arranged to be diffracted by the diffraction element The position where the incident light is incident, corrects the incident light to a specific position by correcting the light emitted by the diffraction element due to the wavelength variation of the emitted light emitted from the light source; and the optical mechanism, It is the light returned by several party light regions after receiving the light path change correction mechanism to correct the light path change. 30. The optical disc device according to item 29 of the patent application, wherein the composite optical element (the diffractive element and the optical path variation correction mechanism are integrally formed by a resin material). For example, the optical disc device according to the scope of patent application No. 29, wherein the diffractive element is a holographic element. 32. The optical medium device according to item 29 of the application, wherein the optical path variation correction mechanism is another diffraction element, and further diffracts the return light diffracted by the diffraction element. I22m is a patented optical disc device of item 32, in which the other diffraction elements are holographic elements. Such as the first patent of the U.S. patent, in which the above-mentioned composite optical step has a light splitting mechanism, which is arranged to return the incident light after the optical path change and the correcting mechanism correct the optical path change. Position, and split the late-return light into several to guide each light-receiving area of the light-receiving mechanism. • For example, the optical disc device of the M range of the patent application, wherein the above-mentioned composite optical π element, the above-mentioned diffraction element, the above-mentioned optical path variation correction mechanism, and the above-mentioned light cutting mechanism are integrally formed by a resin material. The optical disc device according to claim 34 of the patent scope, wherein the above-mentioned optical division mechanism is a prism formed by a plurality of planes or curved surfaces. j7. The optical disc device according to item 36 of the scope of the patent application, wherein the prism of the composite optical element is formed in a substantially quadrangular pyramid shape, and the returned light after the optical path variation correction mechanism corrects the optical path variation is divided into four parts, and The light-receiving area that the light-receiving mechanism receives each of the reflected light divided into four parts by the 稜鏡 is divided into four parts. 3 8. The optical disc device according to item 36 of the scope of patent application, wherein the incident angle of each of the above-mentioned prisms formed by the optical path variation correction mechanism to correct the optical path variation is greater than 0. With 45 or less. between. 39. The optical disc device according to item 29 of the patent application scope, wherein the composite optical element further has a reflection mechanism, which is on the optical path of the emitted light emitted from the light source, and reflects the emitted light on the diffractive element, and / Or make the Ϊ 884884 reflected light at the above-mentioned specific position on the optical path of the returned light after being diffracted by the diffractive element. 40. The light stone dish device according to item 39 of the scope of the patent application, wherein the composite optical element "the above-mentioned shooting element, the above-mentioned optical path variation correction mechanism, and the above-mentioned reflection mechanism are integrally formed by a resin material. 41. If you request a phototherapy device according to item 29 of the patent, the above-mentioned composite optical element further has an additional diffractive element, which is arranged on the optical path between the light source and the diffractive element. The light emitted by the light source is divided into three parts: 0-order light and earth-order light.... The light-receiving mechanism receives 0 times of the return light divided by the light-dividing mechanism and divides 0 times by the additional diffraction element. Light "to obtain poly", a &quot; Wu L, and then receive the light of the soil divided by the above-mentioned additional diffractive element 1 time to obtain the tracking error signal. 42. The optical disc device according to item 41 of the patent application scope, wherein the above-mentioned composite optical element &lt; the above-mentioned diffraction element, the above-mentioned optical path variation correction mechanism, and the above-mentioned other diffraction element are integrally formed by a resin material. For example, the optical disc device according to item 41 of the application, wherein the additional diffractive element is a holographic element. 44. The optical disc device according to item 29 of the patent application scope, wherein the optical path variation correction mechanism corrects astigmatism generated in the optical path of the light beam emitted from the light source. 4) If the optical disc device according to item 29 of the patent application scope, further includes a light shielding mechanism, which is between the light source and the diffractive element, and shields other than the effective light beam in the optical path of the light emitted from the light source. beam. 46. For example, the optical disc device of the 29th scope of the patent application, which further includes a light-shielding mechanism and a light-turning mechanism, which is effective in blocking the light path of the light returned by the specific position guided by the above-mentioned optical path change and correction mechanism. Beams other than beams. 47 · An optical disk device comprising: an optical pickup device for recording and / or reproducing the optical disk of the optical disk; and an optical disk rotation driving mechanism for rotationally driving the optical disk; characterized in that the optical pickup device is provided with: A light source that emits light of a specific wavelength; a beam splitter that separates the optical path of the emitted light from the light source and the reflected light reflected by the optical disc, and corrects the astigmatism at the optical path of the returned light ^ Shifting to the object ^, which focuses the light emitted from the light source onto the &lt; light, and condenses the light emitted from the optical disc; a light cutting mechanism, which is arranged on the The position where the reflected light separated by the beam splitter enters, splits the returned light into several; and a dual light mechanism, which receives the reflected light divided by the light splitting in several light receiving areas; 48 It is called W Fu Feng &lt; 稜鏡 _ ° Applicable to the optical disc device of the 47th scope of the patent application, in which the above-mentioned "a" shape is roughly a quadrangular pyramid shape. Split into 4 section. Owing to 49 l '4, please refer to the optical disc device of the 48th aspect of the patent, in which the incident light on the sides separated by the above-mentioned light-path separating element 7 and 45 are less than or equal to 45. between. For example, the optical disc device of the 47th scope of the patent application, and the middle eight r further has a reverse 1227884: 叩. ° 9: 0 Er You I it: the light emitting mechanism that emits light from the foot, which is reflected from the light emitted from the upper shaft The reflected light is reflected at the specific position on the optical path separation element and / or on the optical path of the reflected light separated by the optical path separation element. The optical disc device according to the scope of patent application No. 48, which further includes an additional diffractive element, which is arranged on the optical path between the light source and the optical path separation element 4 'and divides the light emitted from the light source. There are three parts: 0th order light and ± 1st order light. 52. The optical disc device according to item 47 of the application for a patent, wherein the beam splitter is formed into a substantially flat plate shape including a first surface and a second surface, and the light emitted from the light source is reflected by the first surface, and The returned light passes through the first surface and the second surface at the same time. 53. The optical disc device according to item 47 of the patent application, wherein the beam splitter is formed into a substantially flat plate shape including a first surface and a second surface, and the light emitted from the light source is reflected by the first surface, and The returned light is incident from the first surface, reflected by the second surface, and then transmitted through the first surface. 54. The optical disc device according to item 47 of the scope of patent application, wherein the beam splitter includes at least a first surface, a second surface, and a third surface, and these surfaces are arranged in a roughly isosceles diagonal shape. The first surface reflects outgoing light emitted from the light source, and makes the returned light incident from the first surface, reflects on the second surface, and transmits the third surface. 55. The optical disc device according to item 47 of the patent application scope, further comprising a light shielding mechanism, which is connected between the light source and the beam splitter, and blocks light beams other than the effective light beam in the optical path of the emitted light from the light source. . -10-1227884) 6. The optical disc device according to item 47 of the patent application, which further includes a light shielding mechanism for shielding light beams other than the effective light beam in the optical path of the returned light separated by the beam splitter. 57 · An optical device comprising: a diffractive element that transmits light of a specific wavelength emitted from a light source and continuously emits light returned from an optical disc; and &amp; an optical path change correction mechanism, which is It is arranged at the position where the return light diffracted by the diffractive element is incident, and corrects the change of the optical path of the return light generated by the diffractive element due to the change in the wavelength of the light emitted from the light source. Navigate to a specific location. 58. The optical device of claim 57 in which the above-mentioned diffractive element is a holographic element. 59. For an optical device according to item 57 of the scope of patent application, the above-mentioned optical path variation correction mechanism is another diffractive element, and further diffracts the return light diffracted by the above diffractive element. 60. The optical device according to item 59 of the application, wherein the other diffractive element is a holographic element. 61. The optical device according to item 57 of the scope of patent application, which further includes a light knife cutting mechanism, which is arranged at a position where the incident light returns after the optical path variation correction mechanism corrects the optical path variation, and the incident light It is divided into several rrqs to guide a light receiving mechanism having a plurality of light receiving regions. 6 2 · The optical device according to item 61 of the scope of patent application, wherein the above-mentioned light division mechanism is a frame formed by a plurality of planes or curved surfaces. β. The optical device according to item 62 of the patent application scope, wherein the above-mentioned prism forms 1227.8 雑 Page 丨 ip! Roughly quadrangular pyramid shape, the reflected light after the optical path change correction mechanism corrects the optical path change is divided into 4 parts. . 64. The optical device according to item 62 of the patent application range, wherein the incident angle of the prism formed by the prism formed by the optical path variation correction mechanism to correct the optical path variation is greater than 0. With 45 or less. between. 65. The optical device according to item 57 of the scope of patent application, which further includes a reflection mechanism, which is based on the optical path of the emitted light from the light source, and reflects the emitted light from the above-mentioned diffraction element, and / or On the optical path of the reflected light after the diffraction element is diffracted, the reflected light is reflected at the specific position. 66. The optical device according to item 57 of the scope of patent application, which further has another diffractive element, which is arranged on the light between the light source and the diffractive element, and divides the light emitted from the light source into There are three parts: 〇 light and ± 1 light. 67. The optical device according to claim 66, wherein the additional diffractive element is a holographic element. 68. The optical device according to item 57 of the patent application range, wherein the above-mentioned optical path variation correction mechanism corrects foot astigmatism in the optical path of the light beam emitted from the above-mentioned light source. 69 'The optical device according to item 57 of the patent application, further including a light shielding mechanism, which is located between the light source and the diffraction element, and shields other than the effective light beam in the optical path of the light emitted from the light source. beam. For example, the optical device of Shenqiao Patent No. 57 further includes a light-shielding mechanism, which is directed to a specific position by the above-mentioned optical path variation correction mechanism 1227884 93 · 8. 20 κ reflected light &lt; effective in shielding in the optical path Beams other than beams. 71. An optical device, comprising: a beam splitter, which separates the optical path of the emitted light of a specific wavelength from the light source and the reflected light reflected by the optical disc, and in the optical path of the reflected light Correcting the amount of astigmatism; and a light dividing mechanism, which is arranged at a position where the return light separated by the beam splitter enters, and divides the return light into a plurality of light receiving mechanisms which are guided to have a plurality of light receiving areas; 72. The light The dividing mechanism is a prism composed of several planes or curved surfaces. For example, the optical device of the 71st patent application range, wherein the prism is formed into a substantially quadrangular pyramid shape, and the returned light after the optical path change correction mechanism corrects the optical path change is divided into four parts. 73. For example, according to the 7th aspect of the application for patent, You Zi set the incident angle of the incident light on each side of the above-mentioned beam formed by the optical path separation element to be greater than 0. With 45 or less. between. 74. For example, the optical device according to item 71 of the patent, which further has a reflection mechanism, which reflects the light emitted from the light source and reflects the light path separation element, and returns the light after the path separation element is separated. The optical path hits the above-mentioned specific position. On the optical path of the light, the above-mentioned reflected light is reflected back and / or by the above-mentioned light. 7d. For example, the optical device of the scope of patent application No. 62 further includes an additional diffractive element, which is arranged on the above-mentioned light source and the substrate. On the optical path between the r &amp; optical path separating elements, the light emitted from the light source pair and the emitted light is divided into three parts: 0th order light and 1st order light. 1227884 76. If the optical device according to item 71 of the μ patent scope, the beam splitter is formed into a substantially flat plate shape including a first surface and a second surface, and the light emitted from the light source is reflected by the first surface, The reflected light is transmitted through the first surface and the second surface at the same time. 77. The optical device according to item 7 丨 in the scope of patent application, wherein the beam splitter is formed into a substantially flat plate shape including a first surface and a second surface, and the first surface-reflects the light emitted from the light source. And makes the reflected light incident from the first w to be reflected by the second surface, and then transmitted through the first surface. 78. The optical device according to item 71 of the scope of patent application, wherein the beam splitter includes at least the first surface, the second surface, and the third surface, and these surfaces are arranged in a roughly isosceles triangle shape to form The first surface reflects the light emitted from the light source and the foot, and the reflected light is incident from the first surface, reflected by the second surface, and transmitted through the third surface. 79. The optical device according to item 71 of the scope of patent application, which further includes a light shielding mechanism, which is between the light source and the beam splitter, and blocks light beams other than the effective light beam in the optical path of the light emitted from the light source. . 80. For example, the optical device 71 of the scope of the patent application further includes a shield light mechanism, which shields light beams other than the effective light beam in the optical path of the returned light separated by the beam splitter. 81. A composite optical element including: a diffractive element that transmits light of a specific wavelength emitted from a light source and diffracts light returned from an optical disc: and an optical path variation correction mechanism that is disposed in a The position where the returning light diffracted by the diffractive element is incident is corrected for the pulsation generated by the diffractive element due to the wavelength variation of the light emitted from the light source. Specific location. 82. For the compound optics item No. 81 in the scope of patent application, the above-mentioned diffracting vulture person's above-mentioned optical path change correction mechanism is a loan type. The resin material is integrated into one. 83. The composite optical element such as the scope of the patent application No. 81 is a holographic element. ′ Among them, the above-mentioned diffraction 84. The compound variation correction mechanism such as the item No. 8 丨 in the scope of patent application is the diffraction of the return light from other diffraction elements to be further diffracted. Optical element, wherein the optical path is 85. For example, the composite optical spear of item 4 of the patent scope of the application, ~ only the mouthpiece, in which the other diffraction elements are holographic elements. The paper, such as the composite optical element under the scope of patent application No. 81, further includes a light division mechanism, which is arranged at the position where the incident light returns after the above-mentioned optical path change correction mechanism ^ positive optical path change, and returns the above The light $ is cut into a plurality and guided to a light receiving mechanism having a plurality of light receiving areas. 87. The composite optical element according to item% of the scope of application, wherein the body-wound element, the optical path variation correction mechanism, and the optical division mechanism ^ are integrally formed of a resin material. 8δ. The composite optical element according to item 86 of the patent application scope, wherein the light splitting mechanism is a prism formed by a plurality of planes or curved surfaces. 89. The composite optical element according to the 88th aspect of the patent application, wherein the 稜鏡 is formed into a substantially quadrangular pyramid shape, and the returned light after the optical path variation correction mechanism corrects the optical path variation is divided into four parts. -15-mi 丨 9. If you request a composite optical element in the 88th aspect of the patent, where the above-mentioned 稜鏡 is formed after the optical path change correction mechanism corrects the optical path change, the incident angle of light to each surface is greater than 0. With 45 or less. between. 91. The composite optical element according to item 81 of the patent application scope, further comprising a reflection mechanism, which is based on the optical path of the emitted light emitted from the light source, and reflects the emitted light to the above-mentioned diffractive element, and / or On the optical path of the returned light after being diffracted by the above-mentioned complex diffusing element, the reflected light is reflected 2 at the specific position. 92. The composite optical element according to item 91 of the patent application scope, wherein the above-mentioned illuminating member, the above-mentioned optical path variation correction mechanism, and the above-mentioned reflection mechanism are integrally formed of a resin material. 9j. The composite optical element according to item 81 of the scope of patent application, which further has an "outer diffraction element" which is arranged on the light source and the mirror element ΐ = optical path, and divides the light emitted from the light source There are three parts of 0 long ago and ± 1 time. 94.2 The composite optical element according to item 93 of the patent, wherein the above-mentioned diffraction element is integrally molded by a resin material by a Ko-optical path variation correction mechanism and the above-mentioned additional diffraction element. Private = Please = The composite optical element of item 93, in which the other% L 7L pieces are holographic elements. 96. ^ The compound optical variation correction item No. 81 of the scope of application for patents corrects the above-mentioned light crazy mechanism in the beta 3 harness, which corrects the astigmatism of the light from the east of the light source # 程 中 from the light source. Heart Beam I Light Red -16-