JP2004139695A - Optical part of optical pickup, its holding structure, and optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize high attaching position deciding accuracy in a simple configuration and to easily secure an optical path by reducing bias portions. <P>SOLUTION: The holding structure 32 of the optical part is arranged at an optical path of an optical pickup, has optical functions of one or more selected out of transmission, reflection, refraction, and separation of light, and has constitution which comprises an optical part 31 provided with a convex part 43 projected in the direction previously decided and formed so as to have a slope or tapered part and a supporting member 40 in which a concave part 45 having a shape corresponding to a slope or tapered part of the convex part 43 formed at the optical part 31 is formed. The optical part 31 is supported at the supporting member 40 so that the convex part 45 is engaged with the concave part 45 of the holding member 40. In such holding structure 32 of the optical part, as the convex part 43 can be utilized for a positioning member, high attaching position deciding accuracy can be kept in a simple configuration, and the bias portions can be reduced. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical component of an optical pickup used for an optical information recording / reproducing device, a holding structure thereof, and an optical pickup device.
[0002]
[Prior art]
Optical disks such as compact disks (abbreviated CDs), digital versatile disks (abbreviated DVDs), and mini disks (abbreviated MDs) are frequently used as optical recording media for recording / reproducing information by light. Tracks are formed at a fine pitch on the information recording surface of these optical recording media. In order to record information on this information recording surface or reproduce information from the information recording surface, for example, a light source provided in an optical pickup is used. The emitted light must be accurately condensed and radiated onto a predetermined track on the information recording surface, and the condensed light spot must accurately follow the track of the optical recording medium rotating at high speed.
[0003]
As described above, in order to improve the accuracy of the light condensing position with respect to the track formed at a fine pitch on the optical recording medium and further improve the tracking accuracy with respect to the track, the light emitted from the light source in the optical pickup is condensed on the optical recording medium. It is required that the mounting accuracy of various optical components disposed in the optical path until the optical path is reached and the optical path reflected from the optical recording medium and received by the photodetector be high.
[0004]
In the conventional technology for mounting optical components of an optical pickup, an optical component, for example, a lens is placed on an optical bench, the lens and the optical bench are fixed with an adhesive, and the elasticity of a leaf spring provided on the optical bench is used. Then, the lens is pressed in the direction of the bottom surface of the optical bench to secure the positioning accuracy for mounting the optical component (for example, see Patent Document 1).
[0005]
Further, in another conventional technique, a plurality of substrates having holes formed therein for inserting a positioning member at a predetermined position are prepared, and optical components are positioned at positions determined based on a combination of the holes in a state where a plurality of substrates are stacked. There is a technique in which an optical component is positioned with high accuracy by mounting the optical component (for example, see Patent Document 2).
[0006]
[Patent Document 1]
JP-A-2000-195083
[Patent Document 2]
JP-A-8-273188
[0007]
[Problems to be solved by the invention]
However, the above-described prior art has the following problems. In the technique disclosed in Patent Literature 1, the optical component is positioned using a pressing force due to elasticity of a spring member. In such a positioning method, there is no particular problem when only one direction connecting the opposing surfaces of the optical component is used for the optical path, but a plurality of directions must be used for the optical path by using a plurality of surfaces of the optical component. If this is the case, the spring member may block the optical path.
[0008]
FIG. 6 is a perspective view illustrating a conventional optical component holding structure. FIG. 6A is a perspective view showing a mounted state of the dichroic prism 1 which is one of the optical components. FIG. 6B is a perspective view in which the mounting member 2 is omitted and simplified for easy understanding, and only the pressing direction by the mounting member 2 is indicated by an arrow.
[0009]
The dichroic prism 1 is an optical component made of, for example, glass, and has a rectangular parallelepiped or cubic shape. The dichroic prism 1 includes six first to sixth surfaces 11, 12, 13, 14, 15, and 16, and includes a first optical path 17 and a first surface 11 connecting the first surface 11 and the third surface 13. And a second optical path 18 that is reflected by the reflection surface 19 and connects the second surface 12. That is, the dichroic prism 1 uses the first and second optical paths 17 and 18 formed using the first to third surfaces 11, 12 and 13.
[0010]
The dichroic prism 1 is mounted on the holding member 3. The holding member 3 has a substantially rectangular parallelepiped shape, and the surface 3a of the holding member 3 on which the dichroic prism 1 is to be mounted (hereinafter, referred to as the mounting surface 3a for convenience) is vertically raised so as to stand up. First and second projecting pieces 4 and 5 for positioning are formed. The first and second projecting pieces 4 and 5 are formed so as to extend in a direction parallel to the side surface of the holding member 3 and have a rectangular cross-sectional shape perpendicular to the extending direction. The surfaces of the first and second projecting pieces 4 and 5 facing the inside of the holding member 3 constitute a first reference surface 4a and a second reference surface 5a for positioning the dichroic prism 1, respectively.
[0011]
The dichroic prism 1 contacts the sixth surface 16 with the mounting surface 3a of the holding member 3, the second surface 12 with the first reference surface 4a, and the third surface 13 with the second reference surface 5a. Is placed on the holding member 3. The dimensions of the holding member 3 and the positions where the first and second projecting pieces 4 and 5 are formed are determined in advance in consideration of the dimensions of the dichroic prism 1 in a state where the holding member 3 is fixed to the housing of the optical pickup. The position of the dichroic prism 1 placed on the member 3 is set to be a predetermined position.
[0012]
The positioned state of the dichroic prism 1 mounted on the mounting surface 3a so as to be at a predetermined position must be maintained so as not to change even if it receives an external force such as vibration. In order to maintain the positioning state of the dichroic prism 1 placed on the holding member 3 shown in FIG. 6, a direction from the fourth surface 14 of the dichroic prism 1 to the first reference surface 4a (the direction of the arrow 6), From the three directions, that is, the direction from the first surface 11 to the second reference surface 5a (the direction of the arrow 7) and the direction from the fifth surface 15 to the mounting surface 3a of the holding member 3 (the direction of the arrow 8), It is necessary to apply a pressing force. Hereinafter, a force that presses the optical component against the holding member to maintain the positioning state may be referred to as a bias.
[0013]
The mounting member 2 is provided to constantly apply a bias to the dichroic prism 1 from the above three directions. The mounting member 2 is a leaf spring member made of, for example, a copper alloy, and has first to third leaf spring pieces 2a, 2b, and 2c. An engagement hole 21 and a mounting hole are formed in the mounting member 2 so as to penetrate in the thickness direction. The engaging hole 21 is engaged with the positioning projection 22 formed on the housing of the optical pickup, the screw member 23 is inserted into the mounting hole, and the female screw is formed at a predetermined position of the housing. By screwing, the mounting member 2 is positioned and mounted on the housing.
[0014]
When the mounting member 2 is mounted on the housing, the first leaf spring piece 2a formed on the mounting member 2 applies a bias to the dichroic prism 1 in the direction indicated by the arrow 6, and the second leaf spring piece 2b The bias is applied to the dichroic prism 1 in the direction of the arrow 7, and the third leaf spring piece 2 c can apply a bias to the dichroic prism 1 in the direction of the arrow 8. Thereby, the dichroic prism 1 can maintain the mounted state accurately positioned.
[0015]
However, when the bias must be applied from three directions as described above, the second leaf spring piece 2b is arranged to press the first surface 11 commonly used for the first and second optical paths 17 and 18. Is done. Accordingly, since the light incident on or emitted from the first surface 11 must be set at the incident position or the emitting position so as to avoid the second leaf spring piece 2b, it becomes difficult to secure an optical path, There is a problem that a part of the light beam is shielded and the light amount is reduced. Further, when applying a bias from three directions, the leaf spring pieces 2a, 2b, 2c are pressed against the three surfaces of the first, fourth and fifth surfaces 11, 14, 15 so that the dichroic prism 1 is pressed. Surfaces may be scratched or contaminated. Further, the mounting member 2 to which a bias can be applied from three directions becomes large and requires a large installation space, which is an obstacle to realizing a small and thin device.
[0016]
In the technique disclosed in Patent Document 2, a large number of substrates having holes through which positioning members are inserted are formed by using, for example, a method such as photolithography. There is a problem.
[0017]
SUMMARY OF THE INVENTION An object of the present invention is to provide an optical component of an optical pickup which can realize a high mounting positioning accuracy with a simple configuration, and can easily secure an optical path by reducing a bias portion, and a holding structure thereof. .
[0018]
[Means for Solving the Problems]
The present invention relates to an optical component of an optical pickup disposed on an optical path of an optical pickup and having at least one optical function selected from transmission, reflection, refraction, and separation of light.
An optical component for an optical pickup, comprising: a projection that projects in a predetermined direction and has a slope or a taper.
[0019]
According to the present invention, the optical component of the optical pickup includes a projection that projects in a predetermined direction and is formed to have a slope or a taper. In such an optical component, when the optical component is mounted on an optical pickup and positioned, for example, a projection formed to have a slope or a taper can be used as a positioning member. By using the convex portion formed on the optical component as the positioning member, one direction parallel to the direction in which the convex portion protrudes, or the direction parallel to the direction in which the convex portion protrudes and the direction perpendicular to the direction in which the convex portion protrudes. The optical component can be positioned and mounted with high accuracy only by applying a bias to two directions, one direction selected from the directions. That is, with a simple configuration in which a convex portion having a slope or a taper is formed on the optical component, it is possible to reduce the bias application in at least one direction among the biases that need to be applied from three directions.
[0020]
Further, the present invention is an optical component of an optical pickup disposed on an optical path of the optical pickup and having at least one optical function selected from transmission, reflection, refraction and separation of light, which is predetermined. An optical component having a convex portion that is formed to have a slope or a taper that protrudes in the direction;
A holding member in which a concave portion having a shape corresponding to the gradient or taper of the convex portion formed in the optical component is formed,
An optical component holding structure for an optical pickup, wherein the optical component is held by the holding member such that a projection of the optical component is fitted into a recess of the holding member.
[0021]
According to the present invention, the optical component holding structure has an optical component including a convex portion formed so as to project in a predetermined direction and have a slope or a taper, and a gradient or a taper of the convex portion formed in the optical component. And a holding member having a concave portion of a corresponding shape. The optical component is held by the holding member such that the convex portion of the optical component fits into the concave portion of the holding member. In the optical component holding structure configured as described above, the direction in which the optical component that is the same as the projecting direction of the protrusion formed in the optical component is pressed toward the holding member, or the optical member is pressed toward the holding member. The optical component can be positioned and mounted on the holding member with high accuracy only by applying a bias to two directions, that is, a direction to be performed and one direction selected from directions orthogonal to the direction. Become. With the simple configuration as described above, it is possible to reduce the bias application in at least one direction among the biases that need to be applied from three directions. The number of possible surfaces can be increased, and the optical path can be easily secured.
[0022]
The present invention is also an optical pickup device for recording information on an optical recording medium by light and / or reproducing information from the optical recording medium,
Holding structure of the optical components of the optical pickup,
A light source that emits light,
Light collecting means for collecting light emitted from the light source on the optical recording medium,
A light detecting means for detecting light reflected by the optical recording medium.
[0023]
According to the present invention, since the optical pickup device includes the above-described optical component holding structure, it is possible to position and mount the optical component on the holding member by applying a bias from one or two directions. Therefore, it is possible to make the mounting member for providing a bias to the optical component compact in the optical component holding structure, and to reduce the volume of the space required to accommodate the optical component holding structure. In addition, the size and thickness of the device can be reduced.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a simplified perspective view showing the configuration of an optical component 31 and its holding structure 32 according to a first embodiment of the present invention, and FIG. 2 is an optical pickup including the optical component holding structure 32 shown in FIG. FIG. 2 is a layout diagram illustrating a configuration of an apparatus 30. First, the optical pickup device 30 in which the optical component holding structure 32 is preferably used will be described, and then the optical component holding structure 32 provided in the optical pickup device 30 will be described.
[0025]
FIG. 2A is a layout diagram from the optical modules 34 a and 34 b of the optical pickup device 30 to the rising mirror 37, and FIG. 2B is a right side layout diagram from the rising mirror 37 to the optical recording medium 33. is there.
[0026]
The optical pickup device 30 that records information on the optical recording medium 33 by light and / or reproduces information from the optical recording medium 33 includes a light source that emits light and a light receiving element that receives light reflected by the optical recording medium 33. Optical modules 34a and 34b having light detecting means, a bending mirror 35 for reflecting light emitted from the optical modules 34a and 34b and bending the optical path by 90 degrees, an optical component holding structure 32, an optical module 34a, A collimating lens 36 that converts light emitted from 34b and transmitted through the optical component 31 into parallel light, a rising mirror 37 that reflects light that has passed through the collimating lens 36 and guides the light to the optical recording medium 33, and a rising mirror 37. The objective lens 38 is a condensing unit that condenses the reflected light on the information recording surface of the optical recording medium 33.
[0027]
Two optical modules 34a and 34b are provided. One optical module 34 a includes, for example, a light source that emits infrared light having a wavelength of 750 nm, and a light detection unit that receives the infrared light reflected by the optical recording medium 33. The other optical module 34b includes, for example, a light source that emits red light having a wavelength of 630 nm, and a light detection unit that receives the red light reflected by the optical recording medium 33.
[0028]
The optical component 31 is a dichroic prism 31 that transmits red light that is emitted from the other optical module 34b and is reflected by the bending mirror 35 and enters, and transmits red light that is reflected by the optical recording medium 33 and enters. The infrared light emitted from one optical module 34a is reflected, and the infrared light reflected from the optical recording medium 33 is reflected.
[0029]
The dichroic prism 31 is disposed on the optical path of light emitted from the optical modules 34a and 34b toward the optical recording medium 33 and on the optical path of light reflected by the optical recording medium 33, and transmits and reflects light. At the same time, light having a wavelength of 750 nm and light having a wavelength of 630 nm can be separated.
[0030]
The collimating lens 36 converts the light emitted from the dichroic prism 31 into parallel light as described above. The rising mirror 37 reflects the light that has passed through the collimating lens 36, bends the optical path by 90 degrees, and guides the light to the optical recording medium 33. The light reflected by the rising mirror 37 is collected on the information recording surface of the optical recording medium 33 by the objective lens 38.
[0031]
Hereinafter, an operation of reproducing information from the optical recording medium 33 in the optical pickup device 30 will be described. Light emitted from the optical module 34a is reflected by the reflection surface 39 of the dichroic prism 31 and guided to the collimator lens 36. The light passing through the collimating lens 36 and reflected by the rising mirror 37 is condensed on the information recording surface of the optical recording medium 33 by the objective lens 38. The light reflected by the optical recording medium 33 reenters the dichroic prism 31 by following the above-described optical path in reverse. The light incident on the dichroic prism 31 is reflected by the reflecting surface 39 of the dichroic prism 31 and received by the light detecting means provided in the optical module 34a. The light detecting means is, for example, a light receiving element formed of a photodiode or the like, converts the received light into electric signals, and generates an information reproduction signal and a focusing error signal and a tracking error signal, which are control signals, based on the electric signals. I do. Such an optical module 34a is used, for example, for recording / reproducing information on a CD which is a kind of optical recording medium.
[0032]
The light radiated from the other optical module 34 b has its optical path bent by 90 degrees by the bending mirror 35 and enters the dichroic prism 31. The light incident on the dichroic prism 31 passes through the dichroic prism 31 as it is and is guided to the collimating lens 36. After the collimator lens 36, the same optical path as in the case of the above-described optical module 34a is followed, and the light reflected by the optical recording medium 33 enters the dichroic prism 31 again. The light incident on the dichroic prism 31 is transmitted through the dichroic prism 31, reflected by the bending mirror 35, and guided to the optical module 34b. The light incident on the optical module 34b is received by the light detecting means provided in the optical module 34b. As in the case of the above-described optical module 34a, the light detection means generates an information reproduction signal, and a focusing error signal and a tracking error signal. Such an optical module 34b is used, for example, for recording / reproducing information on a DVD, which is a kind of optical recording medium.
[0033]
Returning to FIG. 1, the optical component holding structure 32 provided in the optical pickup device 30 will be described. The optical component holding structure 32 includes a dichroic prism 31 that is an optical component, a holding member 40 that holds the optical component 31, and a mounting member 41 that positions and mounts a dichroic prism 31 described below with respect to the holding member 40. It consists of.
[0034]
The dichroic prism 31 is an optical component made of, for example, glass. The dichroic prism 31 includes a prism body 42 having a rectangular parallelepiped shape, and a projection 43 formed in a quadrangular pyramid shape, which protrudes in a mounting direction with respect to the holding member 40 which is a predetermined direction. The convex portion 43 formed in the shape of a quadrangular pyramid is formed so that the bottom surface of the quadrangular pyramid is connected to the surface of the prism body 42 facing the holding member 40. Therefore, of the four side surfaces 43a, 43b, 43c, and 43d that form the quadrangular pyramid-shaped convex portion 43, the side surfaces 43a and 43c and the side surfaces 43b and 43d that face each other have a taper.
[0035]
The holding member 40 is made of, for example, zinc or aluminum, and has a substantially rectangular parallelepiped appearance. On a surface 44 of the holding member 40 on which the dichroic prism 31 is to be held (hereinafter, simply referred to as a holding surface), a concave portion 45 formed in a shape corresponding to the above-described quadrangular pyramid-shaped convex portion 43 is formed. Therefore, four inclined surfaces 45a, 45b, 45c, and 45d are formed in the concave portion 45 of the holding member 40 inward in the thickness direction of the holding member 40 so as to correspond to the taper of the convex portion 43.
[0036]
When the convex portion 43 of the dichroic prism 31 and the concave portion 45 of the holding member 40 are fitted, the corresponding side surface of the convex portion 43 and the inclined surface of the concave portion 45 abut. That is, the side surface 43a and the inclined surface 45a, the side surface 43b and the inclined surface 45b, the side surface 43c and the inclined surface 45c, and the side surface 43d and the inclined surface 45d abut, and the dichroic prism 31 moves in a direction orthogonal to the projecting direction of the projection 43. It is constrained and positioned.
[0037]
Therefore, the dichroic prism 31 can be positioned and attached to the holding member 40 only by applying a bias in the direction in which the dichroic prism 31 is pressed against the holding member 40, that is, in one direction indicated by an arrow 46. . The holding member 40 is designed such that the dimensions of the dichroic prism 31 held by the holding member 40 and the surface to be used are considered in advance, and the optical pickup device is set so that the position of the dichroic prism 31 held by the holding member 40 is a predetermined position. 30 is mounted at a predetermined position of the housing.
[0038]
FIG. 3 is a perspective view illustrating a state in which the dichroic prism 31 is mounted on the holding member 40. The mounting member 41 is a resilient leaf spring member made of, for example, a copper alloy, and is provided to apply a bias in a direction in which the dichroic prism 31 is pressed against the holding member 40, that is, in the above-described arrow 46 direction. The mounting member 41 includes a fixing portion 47 fixed to the housing of the optical pickup device 30, a connecting portion 48 vertically rising from the fixing portion 47, and a direction in which the fixing portion 47 is connected to the connecting portion 48 and extends in parallel with the fixing portion 47. And a leaf spring piece 49 extending in the opposite direction.
[0039]
An engaging hole 50 and a mounting hole are formed in the fixing portion 47 of the mounting member 41 so as to penetrate in the thickness direction. The engaging hole 50 is engaged with the positioning projection 51 formed on the housing of the optical pickup device 30, the screw member 52 is inserted into the mounting hole, and the female screw formed at a predetermined position of the housing is formed. The mounting member 41 is mounted on the housing by being screwed into the portion.
[0040]
In a state where the mounting member 41 is mounted on the housing, the leaf spring piece 49 of the mounting member 41 applies a bias to the dichroic prism 31 in the direction of the arrow 46 due to its elasticity, and moves the dichroic prism 31 to the holding member 40. The pressing state can be maintained. As described above, the convex portion 43 of the dichroic prism 31 and the concave portion 45 of the holding member 40 are fitted to each other, and the movement of the dichroic prism 31 in the direction orthogonal to the arrow 46 direction is suppressed. By applying a bias in one direction indicated by (1), the dichroic prism 31 can be accurately positioned, and the accurately positioned mounting state can be maintained.
[0041]
Further, by forming an opening 53 through which light can pass through the connecting portion 48 of the mounting member 41, the surface facing the connecting portion 48 of the dichroic prism 31 can also be used as a light input / output surface. Become.
[0042]
As described above, the surface on which the mounting member 41 presses the dichroic prism 31 is limited to one surface, so that the risk of damaging the surface of the dichroic prism 31 is reduced. In addition, since four surfaces except the two surfaces, that is, the surface pressed by the mounting member 41 of the dichroic prism 31 and the surface mounted on the holding member 40, can be used as the light input / output surface, it is easy to secure the optical path. In addition, the problem of a decrease in the amount of light due to the mounting member can be solved.
[0043]
Further, by reducing the number of biasing directions to one, the number of leaf spring pieces of the mounting member 41 can be reduced. Therefore, the mounting parts can be made compact, the installation space can be reduced, and the apparatus can be made smaller and thinner. It can contribute to the conversion. The mounting member is not limited to the configuration mounted on the housing. For example, by mounting the mounting member on the holding member, the device can be made more compact, so that the device can be further reduced in size and thickness. can do.
[0044]
FIG. 4 is a simplified perspective view showing a configuration of an optical component holding structure 61 according to a second embodiment of the present invention. In FIG. 4, the illustration of the mounting member is omitted, and only the bias direction by the mounting member is indicated by an arrow.
[0045]
The dichroic prism 62, which is an optical component in the present embodiment, includes a prism main body 63 having a rectangular parallelepiped shape, and a convex portion 64 formed in a triangular prism shape protruding in a mounting direction with respect to the holding member 65 which is a predetermined direction. Is provided.
[0046]
The convex portion 64 formed in a triangular prism shape is formed such that one side surface of the triangular prism is continuous with a surface of the prism main body 63 facing the holding member 65. Therefore, the remaining two side surfaces 64a and 64b constituting the triangular prism-shaped convex portion 64 have a taper.
[0047]
The holding member 65 has a substantially rectangular parallelepiped appearance, and a holding surface 66 on which the dichroic prism 62 is to be held has a recess 67 formed in a shape corresponding to the above-described triangular prism-shaped protrusion 64. Is done. Therefore, in the concave portion 67 of the holding member 65, two inclined surfaces 67a and 67b are formed inward in the thickness direction of the holding member 65 so as to correspond to the taper of the convex portion 64.
[0048]
When the convex portion 64 of the dichroic prism 62 and the concave portion 67 of the holding member 65 are fitted, the corresponding side surface of the convex portion 64 and the inclined surface of the concave portion 67 abut. That is, the side surface 64a and the inclined surface 67a and the side surface 64b and the inclined surface 67b are in contact with each other, and the dichroic prism 62 is restrained and positioned in a direction orthogonal to the projecting direction of the convex portion 64 and in the inclined direction of the taper. You.
[0049]
Therefore, the arrow 46 direction, which is the direction in which the dichroic prism 62 is pressed against the holding member 65, is the direction orthogonal to the arrow 46 direction, and also orthogonal to the inclination direction of the taper of the convex portion 64. The dichroic prism 62 can be positioned and attached to the holding member 65 only by applying a bias in two directions of 68 directions.
[0050]
FIG. 5 is a simplified perspective view showing a configuration of an optical component holding structure 71 according to a third embodiment of the present invention. In FIG. 5, the illustration of the mounting member is omitted, and only the bias direction by the mounting member is indicated by an arrow.
[0051]
The dichroic prism 72, which is an optical component in the present embodiment, has a prism main body 73 having a rectangular parallelepiped shape, and a triangular prism having a bottom surface having a right-angled triangular shape. And a projection 74 formed on the bottom surface.
[0052]
The convex portion 74 formed in a triangular prism shape is formed such that one side surface sandwiching the right angle of the triangular prism is continuous with a surface of the prism main body 73 facing the holding member 75 and faces the holding member 75 of the prism main body 73. The side surface 78 adjacent to the surface and another side surface 74b sandwiching the right angle of the triangular prism are formed so as to be continuous in a plane. The remaining side surface 74a constituting the triangular prism-shaped convex portion 74 thus formed has a slope.
[0053]
The holding member 75 has a substantially rectangular parallelepiped appearance, and a holding surface 76 on which the dichroic prism 72 is to be held has a concave portion 77 formed in a shape corresponding to the above-described triangular prism-shaped convex portion 74. Is done. Therefore, in the concave portion 77 of the holding member 75, one inclined surface 77a is formed inward in the thickness direction of the holding member 75 so as to correspond to the gradient of the convex portion 74.
[0054]
When the convex portion 74 of the dichroic prism 72 and the concave portion 77 of the holding member 75 are fitted, the corresponding side surface 74a of the convex portion 74, the inclined surface 77a of the concave portion 77, and the side surface 74b of the convex portion 74 and the wall surface of the concave portion 77, respectively. 77b, and the dichroic prism 72 is prevented from moving in a direction orthogonal to the direction in which the convex portion 74 protrudes and in which the gradient is inclined.
[0055]
Therefore, the arrow 46 direction, which is the direction in which the dichroic prism 72 is pressed against the holding member 75, is the direction orthogonal to the arrow 46 direction and also orthogonal to the inclination direction of the slope of the projection 74. The dichroic prism 72 can be positioned and attached to the holding member 75 only by applying a bias in two directions of 68 directions.
[0056]
As described above, in the present embodiment, the optical component is a dichroic prism, but is not limited thereto, and may be another optical component such as a rising mirror or a bending mirror. Further, the inclination angle of the slope or the taper formed in the convex portion is not limited to the angle exemplified in the present embodiment, and is appropriately selected according to the type of the optical component to be held and the size of the installation space of the apparatus. May be.
[0057]
【The invention's effect】
According to the present invention, an optical component of an optical pickup includes a convex portion that protrudes in a predetermined direction and has a slope or a taper. In such an optical component, when the optical component is mounted on an optical pickup and positioned, for example, a projection formed to have a slope or a taper can be used as a positioning member. By using the convex portion formed on the optical component as the positioning member, one direction parallel to the direction in which the convex portion protrudes, or the direction parallel to the direction in which the convex portion protrudes and the direction perpendicular to the direction in which the convex portion protrudes. The optical component can be positioned and mounted with high accuracy only by applying a bias to two directions, one direction selected from the directions. That is, with a simple configuration in which a convex portion having a slope or a taper is formed on the optical component, it is possible to reduce the bias application in at least one direction among the biases that need to be applied from three directions.
[0058]
Further, according to the present invention, the holding structure for the optical component includes an optical component including a convex portion that projects in a predetermined direction and has a gradient or a taper, and a gradient or a taper of the convex portion formed on the optical component. And a holding member in which a concave portion having a shape corresponding to the above is formed. In the optical component holding structure configured as described above, the direction in which the optical component that is the same as the projecting direction of the protrusion formed in the optical component is pressed toward the holding member, or the optical member is pressed toward the holding member. The optical component can be positioned and mounted on the holding member with high accuracy only by applying a bias to two directions, that is, a direction to be performed and one direction selected from directions orthogonal to the direction. Become. With the simple configuration as described above, it is possible to reduce the bias application in at least one direction among the biases that need to be applied from three directions. The number of possible surfaces can be increased, and the optical path can be easily secured.
[0059]
Further, according to the invention, the optical pickup device includes the above-described optical component holding structure, so that the optical component can be positioned and mounted on the holding member by applying a bias from one or two directions. Therefore, it is possible to make the mounting member for providing a bias to the optical component compact in the optical component holding structure, and to reduce the volume of the space required to accommodate the optical component holding structure. In addition, the size and thickness of the device can be reduced.
[Brief description of the drawings]
FIG. 1 is a simplified perspective view showing a configuration of an optical component 31 and a holding structure 32 thereof according to a first embodiment of the present invention.
FIG. 2 is a layout diagram showing a configuration of an optical pickup device 30 including the optical component holding structure 32 shown in FIG.
FIG. 3 is a perspective view illustrating a state where the dichroic prism 31 is mounted on a holding member 40;
FIG. 4 is a perspective view showing a simplified configuration of an optical component holding structure 61 according to a second embodiment of the present invention.
FIG. 5 is a simplified perspective view showing a configuration of an optical component holding structure 71 according to a third embodiment of the present invention.
FIG. 6 is a perspective view illustrating a conventional optical component holding structure.
[Explanation of symbols]
30 Optical pickup device
31, 62, 72 Optical parts
32, 61, 71 holding structure
33 Optical recording media
34 Optical Module
38 Objective lens
40, 65, 75 holding member
41 Mounting member
43, 64, 74 convex
45, 67, 77 recess

Claims (3)

An optical component of an optical pickup, which is disposed on an optical path of the optical pickup and has at least one optical function selected from transmission, reflection, refraction, and separation of light,
An optical component for an optical pickup, comprising: a projection that projects in a predetermined direction and has a slope or a taper. An optical component of an optical pickup disposed on an optical path of the optical pickup and having at least one optical function selected from transmission, reflection, refraction, and separation of light, wherein the optical component protrudes in a predetermined direction. An optical component having a convex portion formed to have a taper,
A holding member in which a concave portion having a shape corresponding to the gradient or taper of the convex portion formed in the optical component is formed,
An optical component holding structure for an optical pickup, wherein the optical component is held by the holding member such that a convex portion of the optical component is fitted into a concave portion of the holding member. An optical pickup device for recording information on an optical recording medium by light and / or reproducing information from the optical recording medium,
3. An optical pickup holding structure for an optical pickup according to claim 2,
A light source that emits light,
Light collecting means for collecting light emitted from the light source on the optical recording medium,
An optical pickup device, comprising: light detection means for detecting light reflected by the optical recording medium.

Images