WO2005124426A1 - 光ビーム走査装置 - Google Patents
光ビーム走査装置 Download PDFInfo
- Publication number
- WO2005124426A1 WO2005124426A1 PCT/JP2005/011312 JP2005011312W WO2005124426A1 WO 2005124426 A1 WO2005124426 A1 WO 2005124426A1 JP 2005011312 W JP2005011312 W JP 2005011312W WO 2005124426 A1 WO2005124426 A1 WO 2005124426A1
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- WIPO (PCT)
- Prior art keywords
- light beam
- optical element
- refractive optical
- scanning device
- inclined surface
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/47—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light
- B41J2/471—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using the combination of scanning and modulation of light using dot sequential main scanning by means of a light deflector, e.g. a rotating polygonal mirror
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0875—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more refracting elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/108—Scanning systems having one or more prisms as scanning elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
- H04N1/0282—Using a single or a few point light sources, e.g. a laser diode
- H04N1/0283—Using a single or a few point light sources, e.g. a laser diode in combination with a light deflecting element, e.g. a rotating mirror
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
Definitions
- the present invention relates to a light beam scanning device that scans a light beam in a predetermined direction.
- Light beam scanning apparatuses are widely used in image forming apparatuses such as laser printers, digital copying machines, and facsimile machines, bar code reading apparatuses, and inter-vehicle distance measuring apparatuses.
- this type of light beam scanning device scans the light beam in a predetermined direction by deflecting the light beam emitted from the light source device with a polygon mirror (for example, see Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-315720
- Patent Document 2 JP-A-11 231238
- the light beam scanning device using the deflection disk that scans the light beam by the diffraction function while performing the following operations has the following problems.
- the diameter of the deflecting disk must be increased in order to increase the scanning resolution of the light beam. That is, assuming that the scanning range of the light beam is constant, in order to increase the resolution of the scanning of the light beam, a large number of diffraction regions having different diffraction angles along the circumferential direction of the deflection disk. It is necessary to form. Further, in order to obtain a diffraction effect, it is necessary to form a plurality of grating grooves in each diffraction region. For example, assuming that the scanning range of the light beam is ⁇ 10 ° and the resolution of the scanning of the light beam is 0.1 °, the scanning range is scanned by one rotation of the deflection disk.
- the grating groove pitch is 5.1 ⁇ m at the minimum, which is about three times the step height 1.7 / zm at which the first-order diffraction efficiency is maximized.
- the step height is not negligible with respect to the grating groove pitch, the first-order diffraction efficiency is significantly reduced. Therefore, there is also a problem that the diffraction efficiency decreases as the scanning angle increases.
- the diffraction angle and the diffraction efficiency of the diffraction grating depend on the wavelength of the incident light, and the diffraction efficiency directly affects the transmittance. Therefore, when the wavelength of the light beam emitted from the light source device varies, both the diffraction angle and the diffraction efficiency in the diffraction region fluctuate, and the intensity of the light beam at each scanning angle becomes unstable. Furthermore, if there is a temperature change, the diffraction efficiency fluctuates due to a change in the refractive index of the diffraction area, and therefore, it is necessary to further increase the diffraction efficiency at each scanning angle. There is also a problem that the intensity of the light beam is not stable.
- an object of the present invention is to provide a light beam scanning device that can reduce the size of the device even when scanning a light beam with high resolution.
- a refractive optical element in a light beam scanning device that scans a light beam in a predetermined direction, a refractive optical element whose refractive direction changes according to a position in a circumferential direction; A light source device that emits a light beam toward the element, and a rotation drive mechanism that rotates the refractive optical element to move a light beam incident position on the refractive optical element in a circumferential direction.
- the light beam emitted from the light source device is made incident on the disk-shaped refractive optical element in a state where the refractive optical element is rotated by the rotation drive mechanism.
- the light beam is refracted by the refractive optical element and is scanned in a predetermined direction.
- the light beam scanning device scans by the refraction function of the refraction optical element. Therefore, for example, if a large number of inclined surfaces having different refraction angles are formed so as to be adjacent to each other in the circumferential direction, the light beam can be scanned in a predetermined scanning range only by rotating the disk-shaped refraction optical element once. .
- the diameter of the refractive optical element can be reduced even when the resolution of the scanning of the light beam is increased, so that the size of the light beam scanning device can be reduced. it can.
- the refractive optical element transmits a light beam of the light source device incident from one end face and emits the light beam from the other end face.
- the light source device includes a light-emitting element that emits a light beam, a lens that changes a divergence angle of the light-emitting element, and a rotation of the refractive optical element.
- the light beam is emitted in a direction substantially orthogonal to the plane.
- the light source device includes a light emitting element that emits a light beam, a collimator lens that collimates the light beam with the light emitting element, and a rotating plane of the bending optical element.
- a configuration may be adopted in which a light beam is emitted in a direction parallel or oblique to the light beam.
- a mirror that reflects the light beam in a direction substantially orthogonal to the rotation plane of the refractive optical element and makes the light beam enter the refractive optical element is arranged. You.
- the light source device has a collimating lens, a predetermined distance is required between the light source element and the refractive optical element.
- the light beam scanning device can be made thinner.
- the “parallel or oblique direction to the plane of rotation of the refractive optical element” refers to a direction other than the direction perpendicular to the plane of rotation, in which the light beam is emitted.
- the thickness of the light beam scanning device can be reduced as compared with the case where the light source device is arranged so that the light beam is emitted in a direction perpendicular to the rotation plane.
- the light emitting element include a laser diode, a light emitting diode, a laser oscillator, and the like.
- the refractive optical element includes a plurality of divided areas divided in a circumferential direction, and each of the plurality of divided areas has an inclined surface that refracts an incident light beam in a predetermined direction.
- the configuration that has been adopted can be adopted. That is, it is preferable to divide the refractive optical element into a plurality of radially divided regions in the circumferential direction, and to form an inclined surface for refracting the incident light beam in each of the divided regions.
- the inclined surfaces include those having an inclination angle of 0 °.
- the inclined surface in each of the plurality of divided regions, has a constant inclination angle, and in the plurality of divided regions arranged in a circumferential direction, the inclination of the inclined surface is different.
- the angle changes continuously. That is, it is preferable that the inclination angle of the inclined surface is constant in each of the divided regions, and the inclination angle of the inclined surface is increased or decreased in the adjacent divided regions.
- the divided areas are divided at substantially equal angular intervals.
- the light source device can easily control the light source device because a pulsed light beam having a constant interval may be emitted from the light source device.
- the light beam can be made incident on the center position in the circumferential direction of the divided region only by emitting the pulsed light beam at a constant interval from the light source device. In this case, since the light beam can be refracted by the refractive optical element as expected, appropriate scanning of the light beam can be performed.
- the inclined surface is formed only on one side of the refractive optical element.
- ⁇ w is the inclination angle of the inclined surface with respect to the rotation plane of the refractive optical element
- ⁇ ⁇ s is the scanning angle of the light beam emitted from the refractive optical element
- n is the refractive index of the refractive optical element.
- the refractive optical element has an inclined surface that is continuous in a circumferential direction, It is preferable to adopt a configuration in which the inclination angle of the inclined surface continuously changes in the circumferential direction. With this configuration, high-resolution scanning can be performed. Also in this case, it is preferable that the inclined surface is formed only on one side of the refractive optical element. In this case, the inclination angle of the inclined surface with respect to the rotation plane of the refractive optical element is ⁇ w, the scanning angle of the light beam emitted from the refractive optical element is ⁇ s, and the refractive index of the refractive optical element is 11. I did it,
- an anti-reflection treatment is performed on at least an end face of the refractive optical element on the light beam incident side.
- the refractive optical element can be formed of resin. Further, it can be formed of glass. When formed of resin, it is excellent in productivity and can be reduced in weight and cost. Note that even when the resin is formed of resin, if the temperature fluctuates, for example, about ⁇ 50 ° C., the fluctuation of the scanning angle is slight, and the scanning performance is hardly affected. On the other hand, when formed of glass, it is hardly affected by temperature fluctuation, so that the temperature characteristics are stabilized and the light beam scanning device can be used even in a high temperature environment.
- the inclined surface may adopt a configuration in which the inclined surface is inclined in a circumferential direction and a configuration in which the inclined surface is inclined in a radial direction.
- position detecting means for detecting the rotational position of the refractive optical element, based on the detection result of the position detecting means, the rotation of the refractive optical element by the rotation drive mechanism and the rotation from the light source device.
- the emission of the light beam is controlled.
- the rotation operation of the rotation drive mechanism and the light emission operation of the light source device are feedback-controlled based on the rotational position of the refractive optical element, and the light source device The light emission timing and the rotational position of the refractive optical element can be accurately synchronized, and appropriate light beam scanning can be performed.
- the rotation driving mechanism rotates the refractive optical element at a constant speed, and the light source device emits a pulsed light beam at a constant interval toward the refractive optical element.
- the light source device emits a pulsed light beam at a constant interval toward the refractive optical element.
- a light-shielding plate is provided in the middle of the optical path so that the light beam is shielded at a constant interval so that a pulsed light beam enters the refractive optical element at a constant interval. It may be done.
- the rotation drive mechanism may include: A configuration in which the refractive optical element is rotated at a constant speed and the light source device continuously emits a light beam toward the refractive optical element may be adopted.
- FIG. 1 is a perspective view showing a schematic configuration of a light beam scanning device according to a first embodiment of the present invention.
- FIG. 2 is a schematic side view schematically showing a schematic configuration of the light beam scanning device shown in FIG. 1.
- FIG. 3 is a perspective view schematically showing a schematic configuration of a refractive optical element used in the light beam scanning device shown in FIG. 1.
- FIG. 4 is a plan view of the refractive optical element shown in FIG. 3.
- FIG. 5 (A), (B), and (C) are a XX sectional view, a XY sectional view, and a ZZ sectional view of FIG. 4, respectively.
- FIG. 6 is an explanatory diagram in the case where the inclined surface of the refractive optical element shown in FIGS. 3 and 4 includes an inclined surface having an inclination angle of 0 °.
- FIG. 7 is a perspective view schematically showing a schematic configuration of a refractive optical element used in a light beam scanning device according to Embodiment 2 of the present invention.
- FIG. 8 is a configuration diagram of a light beam scanning device according to a third embodiment of the present invention.
- FIG. 9 is a perspective view schematically showing a schematic configuration of a refractive optical element used in the light beam scanning device shown in FIG.
- FIG. 10 is a plan view of the refractive optical element shown in FIG. 9.
- FIG. 11 is a cross-sectional view showing a W-W cross section in FIG. 9.
- FIG. 12 is a perspective view schematically showing a schematic configuration of a refractive optical element used in a light beam scanning device according to a fourth embodiment of the present invention.
- FIG. 13 is a schematic side view schematically showing a schematic configuration of a light beam scanning device according to another embodiment of the present invention.
- FIG. 14 is a schematic side view schematically showing a schematic configuration of a light beam scanning device according to still another embodiment of the present invention.
- FIG. 1 is a perspective view showing a schematic configuration of a light beam scanning device according to Embodiment 1 of the present invention.
- FIG. 2 is a schematic side view schematically showing a schematic configuration of the light beam scanning device shown in FIG. FIG.
- the light beam scanning device 1 shown in FIGS. 1 and 2 includes a light source device 2 for emitting a light beam, a disc-shaped refraction optical element 3 for refracting the light beam emitted from the light source device 2, and a refraction device.
- Drive motor 4 as a rotary drive mechanism for rotating optical element 3, mirror 5 for raising light beam emitted from light source device 2 toward refractive optical element 3, and detecting the rotational position of refractive optical element 3
- an optical encoder 6 as position detecting means.
- the refractive optical element 3 changes its refractive direction in the circumferential direction, as described later.
- the light beam emitted from the light source device 2 is made incident on the refractive optical element 3 while the refractive optical element 3 is rotated, and the light beam is bent by the refractive optical element 3, thereby forming a predetermined light beam. Scan in the direction of.
- the light beam emitted from the light source device 2 is configured to pass through the refractive optical element 3, and the refractive optical element 3 has one end face force. The beam is transmitted and emitted from the other end face.
- the drive motor 4, the mirror 5, and the optical encoder 6 are directly disposed on the frame 8, and the light source device 2 is disposed on the frame 8 via the holder 9.
- the light source device 2 is configured integrally with a laser diode 21 as a light emitting element that emits a light beam, and a collimating lens 22 that converts the light beam emitted from the laser diode 21 into parallel light. .
- a laser beam of 880 nm is emitted from the laser diode 21.
- the light beam is emitted from the light source device 2 in a plane perpendicular to the rotation axis of the drive motor 4, in other words, in a direction parallel to the rotation plane of the refractive optical element 3. I'm like
- the mirror 5 raises the light beam emitted from the light source device 2 in the axial direction of the drive motor 4 and refracts the light beam so as to be substantially orthogonal to the rotation plane of the refraction optical element 3. Light is incident on element 3.
- the mirror 5 is, for example, a total reflection mirror, and is disposed on the emission side of the light source device 2.
- a drive motor 4 is provided beside the mirror 5.
- the drive motor 4 in the present embodiment is a brushless motor that can rotate at a high speed, and is configured to be able to rotate, for example, about 10,000 (rpm).
- the drive motor 4 is not limited to a brushless motor, and various motors such as a stepping motor can be applied. Omit the mirror 5 etc.
- the light emitted from the light source device 2 may be directly guided to the refractive optical element 3.
- a center hole 31 is formed in the refractive optical element 3, and the center hole 31 is fixed to a rotor of the drive motor 4. Therefore, the refractive optical element 3 is configured to be rotatable about the axis of the drive motor 4 (the center of the refractive optical element 3). The detailed configuration of the refractive optical element 3 will be described later.
- the optical encoder 6 is provided so as to face the refractive optical element 3 in the axial direction of the drive motor 4.
- a grating (not shown) is formed on the surface of the refractive optical element 3 facing the optical encoder 6, and the rotational position of the refractive optical element 3 is detected by the optical encoder 6 detecting the grating.
- the rotation operation of the drive motor 4 is controlled based on the detection result of the optical encoder 6.
- the light emitting operation of the laser diode 21 is controlled based on the detection result of the optical encoder 6.
- a photo-power blur or a magnetic sensor may be used instead of the optical encoder 6.
- FIG. 3 is a perspective view schematically showing a schematic configuration of a refractive optical element used in the light beam scanning device shown in FIG.
- FIG. 4 is a plan view of the refractive optical element shown in FIG.
- FIGS. 5 (A), (B), and (C) are a XX cross-sectional view, a Y-Y cross-sectional view, and a Z-Z cross-sectional view of FIG. 4, respectively.
- FIG. 6 is an explanatory diagram in a case where the inclined surfaces of the refractive optical elements shown in FIGS. 3 and 4 include an inclined surface having an inclination angle of 0 °.
- the refractive optical element 3 is formed in a flat disk shape having a center hole 31 at the center, and in the present embodiment, formed of transparent resin. Have been.
- the refracting optical element 3 is formed with a plurality of radially divided areas 32a, 32b, 32c,... (Hereinafter, referred to as divided areas 32) that are circumferentially divided around the center hole 31.
- the divided region 32 is a region divided around the center hole 31 at substantially equal angular intervals in the circumferential direction.
- the number of the divided regions 32 is determined by the number of scanning points of the light beam scanning.
- the refractive optical element 3 is formed of 201 divided regions 32. Therefore, for example, when the scanning range of the light beam is set to ⁇ 10 °, the scanning resolution of the light beam is 0.1 °. Further, for example, assuming that the diameter of the refractive optical element 3 at the position where the light beam is transmitted is 40 mm, the circumferential width of one divided region 32 is 0.63 mm. 3 and 4, the number of divided areas 32 is reduced for convenience of explanation.
- each of the divided regions 32, 33a, 33b, 33c (hereinafter referred to as an inclined surface 33) for refracting an incident light beam are formed so as to be inclined in the radial direction.
- the inclined surface 33 is formed over the entire circumference only on the exit surface (upper surface in FIGS. 1 and 2) of the refractive optical element 3, and the incident surface (lower surface in FIGS. 1 and 2) It is formed in a plane perpendicular to the axis of the drive motor 4. Further, the inclined surface 33 is formed at a constant angle in each of the divided regions 32. That is, as shown in FIG. 5, the radial section of each divided region 32 is formed in a wedge shape.
- each divided region 32 is formed in a trapezoidal shape in which the inner peripheral side and the outer peripheral side are parallel.
- the inclination angle of the inclined surface 33 continuously changes in each of the plurality of divided regions 32 arranged in the circumferential direction.
- the inclined surface 33 in the present embodiment includes one having an inclination angle of 0 °, such as the inclined surface 33e of the divided region 32e shown in FIG.
- the inclination angle of the inclined surface 33 (the inclination angle of the inclined surface 3 with respect to the rotation plane of the refractive optical element 3) is ⁇ w
- the scanning angle of the light beam emitted from the refractive optical element 3 is ⁇ s (see Fig. 2), where n is the refractive index of the refractive optical element 3,
- the inclination angle ⁇ w of the inclined surface 33 of the adjacent divided region 32 gradually increases or decreases.
- the inclination angles ⁇ wa, 0wb, and 0wc of the inclined surfaces 33a, 33b, and 33c of the adjacent divided regions 32a, 32b, and 32c gradually increase. It is supposed to.
- the inclined surface 33d of the divided region 32d is inclined toward the inner periphery, and the inclined surface 33f of the divided region 32f is inclined. It is inclined toward the outer circumference. Then, between the divided region 32d and the divided region 32f, there is a divided region 32e in which the inclination angle of the inclined surface 33e is 0 °.
- the inclination angle toward the inner circumference Assuming that the inclination angle toward the circumference is a positive inclination angle and a negative inclination angle, respectively, the inclination angle ⁇ w of the inclined surface 33 gradually decreases from the positive inclination angle in the circumferential direction to a negative inclination angle. After that, the inclination angle gradually decreases and returns to a positive inclination angle after one lap. It should be noted that the positive inclination angle and the negative inclination angle gradually decrease from the positive inclination angle to a negative inclination angle, and then gradually increase from the negative inclination angle to a positive inclination angle.
- the inclined surface 33 may be formed so as to repeat in the direction.
- an anti-reflection treatment is applied to at least the end face on the light beam incident side.
- the entire surface of the refractive optical element 3 is subjected to an antireflection treatment using a thin film or a fine structure.
- the refractive optical element 3 of the present embodiment may be made by directly manufacturing transparent resin by ultra-precision processing such as cutting, or by using a mold in consideration of the manufacturing cost.
- ultra-precision processing such as cutting
- a mold in consideration of the manufacturing cost.
- the refractive optical element 3 is cut by fly cut or shaper cut. Since the inclined surface 33 in the present embodiment is formed so as to be inclined in the radial direction, the direction in which the cutting edge used for cutting is advanced is set in the radial direction of the refractive optical element 3. More specifically, the direction in which the cutting edge advances is also set so that the central force of the bending optical element 3 is directed toward the outer peripheral side or toward the center from the outer peripheral side.
- a light beam scanning method in the light beam scanning device 1 of the present embodiment will be described below.
- the refractive optical element 3 is driven by the drive motor 4 and rotates at a predetermined rotation speed. This In this state, the light beam is emitted from the laser diode 21 and is collimated by the collimator lens 22. Then, the light beam is raised by the mirror 5 and enters the end surface of the refractive optical element 3 on the incident side so as to be substantially orthogonal. More specifically, the light beam is directed toward the center of one divided area 32 in the circumferential direction.
- the effective diameter of the light beam incident on the refractive optical element 3 be equal to or less than the circumferential width of one divided region 32.
- the effective diameter of the light beam incident on the refractive optical element 3 is equal to or greater than the circumferential width of one divided region 32, and the light beam is incident over a plurality of divided regions 32. ,.
- the light beam incident on the divided area 32 adjacent to the divided area 32 (and the adjacent divided area 32) is the light beam transmitted through the divided area 32 on which the light beam is to be incident. This is because the light is emitted with a directional force away from it. Therefore, even if the effective diameter of the light beam is larger than the circumferential width of one divided region 32, it does not cause noise.
- the effective diameter of the light beam incident on the refractive optical element 3 is equal to or less than the circumferential width of one divided region 32.
- the light beam that has entered the divided region 32 of the refractive optical element 3 is refracted by the inclined surface 33 and emitted when transmitting through the refractive optical element 3.
- the light is refracted and emitted in a direction of a scanning angle ⁇ si in a certain divided region 32.
- the scanning angle ⁇ si and the angle of 0.1 ° The light is refracted and emitted in the direction of the scanning angle ⁇ s2 having an angle difference.
- the light beams are sequentially emitted, for example, at intervals of 0.1 ° and are scanned in a predetermined scanning range.
- the light beam is emitted without being refracted.
- the rotation operation of the drive motor 4 and the light emission operation of the laser diode 21 are controlled based on the detection result of the rotation position of the refractive optical element 3 by the optical encoder 6. . That is, based on the detection result of the optical encoder 6, the drive motor 4 is driven so that the light beam emitted from the laser diode 21 is directed toward the center of the one divided region 32 in the circumferential direction. And the light emission timing of the laser diode 21 are controlled. (Major effects of the present embodiment)
- the light beam emitted from the light source device 2 is incident on the refractive optical element 3 while the drive motor 4 is being rotated, and the light beam is reflected by the refractive optical element 3.
- the light beam is scanned in a predetermined direction by refracting the beam. That is, the light beam is scanned by the refraction function. Therefore, by forming a large number of inclined surfaces 33 having different refraction angles in the circumferential direction, a predetermined scanning range can be scanned by rotating the refraction optical element 3 once.
- a diagonal surface 33 having one refraction angle ⁇ w is formed on the refraction optical element 3 in order to emit a light beam at one scanning angle, as in a deflecting disk having a diffraction function.
- a deflecting disk having a diffraction function There is no need to provide a plurality of grating grooves to emit a light beam at one scanning angle. Therefore, even if the resolution of scanning of the light beam is increased, the diameter of the refractive optical element 3 can be reduced, and as a result, the size of the apparatus can be reduced.
- the refractive optical element 3 has a flat disk shape, it is possible to reduce the thickness of the device.
- the circumferential width of the divided region 32 at the light beam transmission position is 0.63 mm, the inclined surface 33 can be sufficiently formed.
- the refractive optical element 3 used in the present embodiment the refractive action is used, and the refractive angle is hardly affected by the wavelength of the incident light beam. Therefore, the light beam scanning device 1 of the present embodiment can scan a light beam having a stable intensity. Further, even if the refractive optical element 3 has a temperature change, the change in the transmittance due to the temperature change is small compared to the change in the diffraction efficiency. Therefore, a light beam having a stable intensity can be scanned without being affected by temperature fluctuations.
- the light beam emitted from the light source device 2 is configured to pass through the refractive optical element 3. Therefore, even if the refraction optical element 3 rotated by the drive motor 4 rotates or fluctuates, the refraction angle hardly changes. Therefore, the scanning jitter of the light beam is good.
- the light source device 2 includes a laser diode 21 that emits a light beam and a collimator lens 22.
- the light beam is emitted from the light source device 2 in a direction parallel to the rotation plane of the refractive optical element 3, and the emitted light beam is emitted. Is raised at a right angle by the mirror 5 and is incident on the refractive optical element 3 so as to be substantially orthogonal to the rotation plane of the refractive optical element 3.
- the light source device 2 includes the collimating lens 22, it is necessary to adjust the distance between the collimating lens 22 and the light emitting element 21 in order to adjust the size of the light beam.
- the light beam emitted from the light source device 2 is configured to enter the refractive optical element 3 via the mirror 5. Therefore, a predetermined distance can be secured between the light emitting element 21 and the refractive optical element 3. Further, since the light beam is emitted in a direction parallel to the rotation plane of the refracting optical element 3, the thickness of the light beam scanning device 1 can be reduced.
- the refractive optical element 3 is composed of a plurality of radially divided areas 32 divided in the circumferential direction, and each of the divided areas 32 has an inclined surface 33 for refracting an incident light beam. Is formed. Therefore, the refractive optical element 3 can be formed with a simple configuration.
- each of the divided regions 32 is formed with an inclined surface 33 having a constant angle, and the inclined angle ⁇ w of the inclined surface 33 of the adjacent divided region 32 gradually increases or decreases. . Therefore, with a simple configuration, a light beam can be sequentially emitted at each scanning angle ss.
- the divided region 32 is a region divided around the center hole 31 at substantially equal angular intervals in the circumferential direction. Therefore, if the rotation speed of the drive motor 4 is constant, the light source device 2 only needs to emit a pulsed light beam at a constant interval, so that the control of the light source device 2 becomes easy.
- the inclined surface 33 is formed only on the surface on the emission side of the refractive optical element 3, and the surface on the incident side is formed in a planar shape. Therefore, when the refractive optical element 3 is manufactured using a mold, only the piece processing force of the mold is required, so that the mold is easily manufactured. Further, when the refractive optical element 3 is manufactured by directly cutting and manufacturing a transparent resin, the surface on the incident side is flat, so that the material is fixed and the processing is easy immediately.
- the refractive optical element 3 has been subjected to an anti-reflection treatment. Therefore, it is possible to reduce the amount of light returning to the light source device 2 which may cause a variation in the output of the light source device 2. In addition, since the transmittance is improved, the loss of the light amount from the light source device 2 can be reduced. Wear. It is not necessary to perform the antireflection treatment on the refractive optical element 3 as long as the required amount of light can be obtained in a higher-level device in which the light beam scanning device 1 is used. In this case, the configuration of the refractive optical element 3 can be simplified, and its manufacture becomes easy.
- the refractive optical element 3 is made of resin. Therefore, the refractive optical element 3 is excellent in productivity, and the light beam scanning device 1 can be reduced in weight and cost can be reduced. Note that even if there is a temperature fluctuation of, for example, about ⁇ 50 ° C., the fluctuation rate of the scanning angle ss is 1% or less, and there is almost no influence on the scanning performance.
- the rotation of the drive motor 4 and the light emission timing of the laser diode 21 are adjusted so that the light beam emitted from the laser diode 21 is incident toward the center of the circumferential width of one divided region 32. Is controlled. Therefore, it is possible to accurately synchronize the light emission timing of the laser diode 21 with the rotational position of the refractive optical element 3, and to perform appropriate light beam scanning.
- FIG. 7 is a perspective view schematically showing a schematic configuration of a refractive optical element used in the light beam scanning device according to the second embodiment of the present invention. Since the basic configurations of the light beam scanning device and the bending optical element according to the present embodiment are the same as those of the first embodiment, the same reference numerals are given to the common parts, and detailed description thereof will be omitted. I do.
- a plurality of divided regions 32 are formed in the circumferential direction, and the inclined surface 33 is formed in each of the divided regions 32, as shown in FIG.
- the refractive optical element 3 may be configured as described above.
- the refractive optical element 3 is formed with an inclined surface 33 that is continuous in the circumferential direction, and the inclined angle of the inclined surface 33 with respect to the radial direction changes continuously in the circumferential direction.
- the refractive optical element 3 thus configured has a cross section taken along the line XX, line YY, and line ZZ shown in FIG. , (B), and (C), the tilt angle ⁇ w in the radial direction gradually increases or decreases in the circumferential direction. Therefore, when a light beam is incident on the refractive optical element 3 while rotating the refractive optical element 3, the light beam is refracted by the inclined surface 33 and scanned when passing through the refractive optical element 3. In this case, the laser can be continuously oscillated to maximize the resolution Note that the inclined surface 33 of the refractive optical element 3 has a continuously changing inclination angle in the circumferential direction. 1S Since the diameter of the incident beam is small, the change in inclination in this direction can be neglected. Scanning of element 3 in the tangential direction is negligible.
- FIG. 8 is a configuration diagram of a light beam scanning device according to Embodiment 3 of the present invention.
- FIG. 9 is a perspective view schematically showing a schematic configuration of a refractive optical element used in the light beam scanning device shown in FIG.
- FIG. 10 is a plan view of the refractive optical element shown in FIG.
- FIG. 11 is a cross-sectional view showing a W-W cross section of FIG. Since the basic configuration of this embodiment is the same as that of the first embodiment, common portions are denoted by the same reference numerals and description thereof is omitted.
- the inclined surface 33 for refracting the incident light beam is formed so as to be inclined in the radial direction.
- the inclined direction of the inclined surface 33 is limited to the radial direction. Not determined.
- an inclined surface 33 which is inclined at a constant angle in a circumferential direction may be formed in each of the divided regions 32 constituting the refractive optical element 3.
- the inclined surface 33 is formed only on the surface on the emission side of the refractive optical element 3, and the cross section of each divided region 32 has a wedge shape. More specifically, the cross section of each divided region 32 is formed in a trapezoid shape in which the adjacent surface to the adjacent divided region 32 is parallel.
- the inclined surface 33 includes one having an inclination angle of 0 °.
- the inclination angles of the inclined surfaces 33g, 33h, and 33i of the adjacent divided regions 32g, 32h, and 32i satisfy the relationship shown in FIG.
- the point that the force is gradually increased wg, 0 wh, 0 wi is also the same as the above-mentioned embodiment.
- the inclined surface 33 may be an inclined surface 33 that is inclined toward the side opposite to the inclination direction shown in FIG. That is, in FIG. 11, the inclined surface 33 on the left side of the center may be a leftward inclined surface, and the inclined surface on the right side of the center may be a rightward inclined surface.
- the transparent resin is directly manufactured by ultra-precision processing such as cutting similarly to the first and second embodiments.
- it may be manufactured using a mold in consideration of the manufacturing cost.
- one inclined surface 33 is formed by setting the direction in which the cutting edge to be used for cutting proceeds in the radial direction of the refractive optical element 3.
- the refractive optical element 3 is rotated at a predetermined angle in the circumferential direction to form the inclined surface 33 of the adjacent divided region 32.
- FIG. 12 is a perspective view schematically showing a schematic configuration of a refractive optical element used in a light beam scanning device according to Embodiment 4 of the present invention. Since the basic configurations of the light beam scanning device and the refractive optical element according to the present embodiment are the same as those of the third embodiment, the same reference numerals are given to the common components, and their detailed descriptions are omitted. .
- a plurality of divided regions 32 are formed in the circumferential direction, and each of these divided regions 32 has a constant inclination angle ⁇ w for each divided region.
- the surface 33 is formed, in the present embodiment, as shown in FIG. 12, a plurality of divided regions 32 are formed in the circumferential direction, and each of these divided regions 32 has an inclination angle ⁇ in the circumferential direction.
- An inclined surface 33 in which w continuously changes in the circumferential direction is formed. The shape of this surface is a quadratic function in the tangential direction, and the slope represented by the first derivative changes continuously with respect to the tangential direction.
- the light beam incident on the refractive optical element 3 is refracted by the inclined surface 33 when passing through the refractive optical element 3, and 3 will be scanned in the tangential direction.
- the inclined surface 33 is inclined only to one side, and it may be a U-shaped parabolic parabola as in the example, or may be a sin curve.
- the power configured so that the light beam emitted from the light source device 2 passes through the refractive optical element 3 As shown in the light beam scanning device 1 shown in FIG.
- the light beam emitted from the lens enters the upper surface force of the refractive optical element 3 and then reflects on the lower surface, and then emerges from the upper surface.
- the light beam is refracted in a predetermined direction on the upper surface and scanned.
- a light beam is incident on the refractive optical element 3 from obliquely above the refractive optical element 3 as shown in FIG. Further, in this case, the mirror 5 becomes unnecessary, and in that respect, the configuration of the light beam scanning device 1 can be simplified.
- the inclined surface 33 is formed only on the surface on the force incident side, which is formed only on the surface on the output side (the upper surface in FIGS. 1 and 8) of the refractive optical element 3. You may do so.
- an inclined surface may be formed on both the exit side surface and the entrance side surface. In the case where inclined surfaces are formed on both surfaces, for example, the angle of inclination of the surface on the incident side may be set to be the same in all divided regions 32.
- the refractive optical element 3 is formed of resin, but the refractive optical element 3 may be formed of glass. In this case, since the temperature characteristics are hardly affected by the temperature fluctuation, the temperature characteristics are stabilized, and the light beam scanning device can be used even in a high temperature environment.
- the inclined surface 33 does not necessarily need to be formed over the entire circumference of the exit side surface of the refractive optical element 3, and a flat plane portion is formed on a part of the exit side surface which does not need to be formed.
- a Hall element or an MR element provided inside the drive motor 4 may be used as the position detecting means.
- a driving magnet or a magnet for pulse generation of the driving motor 4 and a back electromotive force pulse are formed, and based on the pulse, the light beam emitted from the laser diode 21 is divided into one divided region 32.
- the light emission timing of the laser diode 21 may be controlled so that the light is incident toward the center position in the circumferential direction.
- the light beam scanning device may not include the position detecting means.
- the refractive optical element 3 when the refractive optical element 3 is composed of a plurality of divided regions 32 divided at substantially equal angular intervals in the circumferential direction, or when a continuous inclined surface is formed in the circumferential direction.
- the drive motor 4 is controlled to rotate at a constant speed and a pulse-like light beam is emitted from the light source device 2 at a constant interval, it is possible to perform appropriate light beam scanning. .
- the light beam may be emitted from the light source device 2 toward the rotation plane of the refractive optical element 3 and may be directly incident on the refractive optical element 3 without providing the mirror 5.
- the light source device 2 is disposed obliquely below the refractive optical element 3 so that the light beam enters the refractive optical element 3 from obliquely below the refractive optical element 3. A little bit.
- the light beam emitted from the light source device 2 is configured to pass through the refractive optical element 3.
- the light source device The light beam emitted from 2 may be configured to be reflected by the refractive optical element 3.
- the light beam emitted from the light source device 2 is reflected on the upper surface of the refractive optical element 3, but the light beam on the upper surface of the refractive optical element 3 changes in the circumferential direction. Is scanned in the direction of.
- a light beam enters the refractive optical element 3 from above the refractive optical element 3 as shown in FIG.
- the mirror 5 is not required, and the configuration of the light beam scanning device 1 can be simplified in that respect.
- the light beam is scanned by the refraction function. Therefore, for example, by forming a large number of inclined surfaces having different refraction angles on the refractive optical element so as to be adjacent to each other in the circumferential direction, a predetermined scanning range can be scanned by rotating the disk-shaped refractive optical element once. be able to.
- an inclined surface having one refraction angle is formed on the refraction optical element, and the light beam is emitted to one scanning angle like a deflection disk having a diffraction function.
- the diameter of the refractive optical element can be reduced even when the scanning of the light beam is performed with high resolution. The size of the device can be reduced.
- the refractive index angle and the transmittance are hardly affected by the wavelength of the incident light beam. Therefore, when a refractive optical element is used, a light beam having a stable intensity can be scanned. Further, a change in transmittance due to a temperature change in the refractive optical element is slight, and the temperature characteristics of the light beam scanning device can be improved.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Laser Beam Printer (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006514827A JPWO2005124426A1 (ja) | 2004-06-21 | 2005-06-21 | 光ビーム走査装置 |
US11/630,523 US20090225386A1 (en) | 2004-06-21 | 2005-06-21 | Light beam scanning device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004182754 | 2004-06-21 | ||
JP2004-182754 | 2004-06-21 |
Publications (1)
Publication Number | Publication Date |
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WO2005124426A1 true WO2005124426A1 (ja) | 2005-12-29 |
Family
ID=35509841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/011312 WO2005124426A1 (ja) | 2004-06-21 | 2005-06-21 | 光ビーム走査装置 |
Country Status (5)
Country | Link |
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US (1) | US20090225386A1 (ja) |
JP (1) | JPWO2005124426A1 (ja) |
KR (1) | KR20070026610A (ja) |
CN (1) | CN1969218A (ja) |
WO (1) | WO2005124426A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2007155467A (ja) * | 2005-12-05 | 2007-06-21 | Nidec Sankyo Corp | 光ビーム走査装置 |
JP2011519053A (ja) * | 2008-04-03 | 2011-06-30 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 制御可能な光角度選択器 |
Families Citing this family (10)
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US9720443B2 (en) * | 2013-03-15 | 2017-08-01 | Nike, Inc. | Wearable device assembly having athletic functionality |
KR102441588B1 (ko) | 2017-07-10 | 2022-09-07 | 삼성전자주식회사 | 빔 스캐닝 장치 및 이를 포함하는 광학 장치 |
CN111279219A (zh) * | 2019-01-09 | 2020-06-12 | 深圳市大疆创新科技有限公司 | 扫描模组、测距装置及移动平台 |
TWI748282B (zh) * | 2019-11-13 | 2021-12-01 | 陳彥宏 | 掃描裝置 |
TWI805100B (zh) * | 2019-11-13 | 2023-06-11 | 陳彥宏 | 掃描裝置 |
CN113116293B (zh) * | 2019-12-31 | 2023-01-03 | 苏州佳世达光电有限公司 | 口腔扫描装置及光学平面的标定装置 |
CN113946046A (zh) * | 2020-07-17 | 2022-01-18 | 深圳光峰科技股份有限公司 | 光束偏移装置以及投影系统 |
CN114675474A (zh) * | 2020-12-24 | 2022-06-28 | 成都极米科技股份有限公司 | 一种切换式微致动部以及微致动装置 |
CN113419339B (zh) * | 2021-04-07 | 2023-08-08 | 电子科技大学 | 光学延迟结构 |
CN114415194B (zh) * | 2022-04-01 | 2022-06-14 | 长沙思木锐信息技术有限公司 | 基于飞行时间探测的片上激光雷达系统 |
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KR20040011761A (ko) * | 2002-07-30 | 2004-02-11 | 삼성전자주식회사 | 화소이동수단을 구비하는 고해상도 디스플레이 |
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- 2005-06-21 US US11/630,523 patent/US20090225386A1/en not_active Abandoned
- 2005-06-21 CN CNA2005800202197A patent/CN1969218A/zh active Pending
- 2005-06-21 WO PCT/JP2005/011312 patent/WO2005124426A1/ja active Application Filing
- 2005-06-21 JP JP2006514827A patent/JPWO2005124426A1/ja active Pending
- 2005-06-21 KR KR1020067026789A patent/KR20070026610A/ko not_active Application Discontinuation
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JPS5662219A (en) * | 1979-10-26 | 1981-05-28 | Shinko Electric Co Ltd | Mirror for laser beam scanning |
EP0206454A2 (en) * | 1985-06-12 | 1986-12-30 | Mitsubishi Denki Kabushiki Kaisha | Stationary hologram scanner |
JPH0611660A (ja) * | 1992-02-13 | 1994-01-21 | Holotek Ltd | 光ビーム・スキャナおよびこれを使用するシステム |
JPH1144750A (ja) * | 1997-05-30 | 1999-02-16 | Aisin Seiki Co Ltd | 光レ−ダ |
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JP2007155467A (ja) * | 2005-12-05 | 2007-06-21 | Nidec Sankyo Corp | 光ビーム走査装置 |
JP2011519053A (ja) * | 2008-04-03 | 2011-06-30 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | 制御可能な光角度選択器 |
Also Published As
Publication number | Publication date |
---|---|
US20090225386A1 (en) | 2009-09-10 |
JPWO2005124426A1 (ja) | 2008-04-17 |
KR20070026610A (ko) | 2007-03-08 |
CN1969218A (zh) | 2007-05-23 |
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