JP4315838B2 - Diffraction grating holder and optical head device - Google Patents

Description

  The present invention relates to a diffraction grating holder and an optical head device.

  The optical head device optically reads or writes signals on, for example, a signal recording medium. A semiconductor laser and a diffraction grating are incorporated in a housing provided in the optical head device. By the way, in order for the optical head device to optically read or write a signal to a signal recording medium or the like, the optical axis of the laser beam emitted from the semiconductor laser or the focal position on the signal recording medium or the like is not shifted. Must be accurately positioned. Therefore, a laser beam emitted from a semiconductor laser is diffracted by a diffraction grating to form a diffracted beam, and a zero-order light beam and a ± first-order light diffracted beam are used for tracking control by a three-beam method or a differential push-pull method. Corresponding optical head devices are mainstream.

FIG. 8 is an exploded perspective view showing the incorporation of the semiconductor laser and the diffraction grating into the housing in the manufacturing process of the optical head device.
The housing 10 is formed with a cylindrical hole 19 that forms an optical path of a laser beam emitted from the semiconductor laser 15. The diffraction grating 5 diffracts the laser beam emitted from the semiconductor laser 15 to form a diffracted beam. The diffraction grating 5 is incorporated into the cylindrical hole 19, and the laser holder 18 is incorporated via the spring member 20. The laser holder 18 is provided with a hollow hole, and is held by incorporating the semiconductor laser 15 into the hollow hole. The semiconductor laser 15 and the laser holder 18 are assembled into the housing 10 while being pressed in the optical axis direction by the pressing plate 21 on the surface where the semiconductor laser 15 does not emit a laser beam. Then, it is fixed to the housing 10 by the set screw 22 through the pressing plate 21 while being pressed.

  The side of the diffraction grating 5 that emits the diffracted beam is positioned by making the diameter of the cylindrical hole 19 smaller than that of the diffraction grating 5 as the laser beam emitted from the semiconductor laser 15 is emitted. It is done. On the side where the laser beam emitted from the semiconductor laser 15 enters, the semiconductor laser 15 and the laser holder 18 are fixed to the housing 10, whereby an elastic force is applied to the spring member 20 and the diffraction grating 5 is pressed. However, it is incorporated into the cylindrical hole 19.

Furthermore, the through hole 23 is provided in the housing 10 so as to reach the diffraction grating 5 incorporated in the cylindrical hole 19. By inserting a diffraction direction adjusting member (not shown) into the through-hole 23 and engaging with the diffraction grating 5, the rotation axis of the diffraction grating 5 (same axis as the laser beam emitted from the semiconductor laser 15) is the center. The diffraction direction of the laser beam emitted from the semiconductor laser 15 can be adjusted by rotating.
JP 2003-67942 A

  As described above, in the operation of assembling the semiconductor laser 15 and the diffraction grating 5 into the housing 10 in the manufacturing process of the optical head device, the spring member 20, the pressing plate 21, and the set screw 22 are necessary, and the manufacturing cost is increased. The installation work was complicated.

  Further, when the spring member 20 that presses the diffraction grating 5 with an elastic force is not long enough to apply the elastic force, or the shape of the spring member 20 interferes with the laser beam emitted from the semiconductor laser 15. There is a case. In this case, the spring member 20 needs to be replaced. After the spring member 20 is incorporated into the cylindrical hole 19 formed in the housing 10, the laser holder 18 and the semiconductor laser 15 are incorporated, and the pressing plate 21 and the like. Since it is fixed by the set screw 22, the fixed state by the pressing plate 21 and the set screw 22 is once released, the semiconductor laser 15, the laser holder 18, and the spring member 20 are taken out from the cylindrical hole 19, and another In some cases, the trouble of repeating the work of assembling a spring member (not shown), the semiconductor laser 15 and the like may occur.

  Further, the diffraction direction of the diffraction grating 5 is adjusted by inserting a diffraction direction adjusting member into a through-hole 23 provided in the housing 10 and engaging with the diffraction grating 5. This is done by rotating around the same axis as the emitted laser beam, but the force should be applied only to rotate the diffraction grating 5, so that the diffraction direction adjusting member is engaged with the diffraction grating 5. As a result, a force is applied in a direction perpendicular to the rotation axis when the diffraction grating 5 is rotated, and the diffraction grating 5 itself may be displaced.

  Therefore, the present invention can reduce the manufacturing cost in the work of assembling the diffraction grating into the housing in the manufacturing process of the optical head device, simplify the work of assembling the diffraction grating and releasing the fixed state, and An object of the present invention is to provide a diffraction grating holder and an optical head device capable of suppressing the displacement of the diffraction grating itself by the diffraction direction adjusting member in adjusting the diffraction direction of the grating.

The invention for solving the above-mentioned problems is a diffraction grating holder for holding a diffraction grating for diffracting incident light and engaging with a housing, and surrounding the diffraction grating in a direction crossing the optical axis of the incident light. A pair of elastic holding plates that are engaged with the housing at a position where the diffraction grating is engaged with the housing, and an optical path hole for the incident light to enter the diffraction grating. to support the elastic holding plates, in locking position of the diffraction grating with respect to the housing, and a resilient support plate for pressing an elastic said diffraction grating from the light incident side of the incident light, the pair of elastic holding One elastic holding plate of the plates has a diffraction direction adjusting member for adjusting the diffraction direction of the diffraction grating at a position where it is engaged with the housing. It characterized in that it has an adjusting hole for insertion through.

Further, a semiconductor laser, a diffraction grating that diffracts a laser beam emitted from the semiconductor laser, a housing in which the semiconductor laser and the diffraction grating are incorporated, a diffraction grating that holds the diffraction grating and is engaged with the housing An optical head device having a holder, wherein the diffraction grating holder elastically holds the periphery of the diffraction grating in a direction intersecting an optical axis of a laser beam emitted from the semiconductor laser, and The pair of elastic holding plates that are engaged with the housing at the position where the diffraction grating is engaged, and an optical path hole for allowing a laser beam emitted from the semiconductor laser to enter the diffraction grating. In addition to supporting between the holding plates, the diffraction grating is locked to the housing relative to the housing. An elastic support plate that elastically presses the diffraction grating from a light incident side of a laser beam emitted from the semiconductor laser, and the housing is a position where the pair of elastic holding plates are engaged with the housing. in having a locking member for locking the pair of elastic hold plate, and a through hole diffraction direction adjusting member is inserted for adjusting the direction of diffraction of the diffraction grating, the pair of elastic holding one elastic retaining plate in the plate, in the locking position of said housing, and wherein the Turkey which have a regulating hole for the diffraction direction adjusting member is inserted through the through hole of the housing To do.

  According to the present invention, it is possible to reduce the manufacturing cost in the work of assembling the diffraction grating into the housing in the manufacturing process of the optical head device, simplify the work of assembling the diffraction grating and releasing the fixed state, and In the adjustment of the diffraction direction of the grating, it is possible to provide a diffraction grating holder and an optical head device that can suppress the displacement of the diffraction grating itself by the diffraction direction adjusting member.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

=== Configuration of diffraction grating holder ===
The outline of the diffraction grating holder according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of a diffraction grating holder according to the present invention. FIG. 2 is a hexahedral view of the diffraction grating holder according to the present invention, where (a) is a plan view, (b) is a bottom view, (c) is a side view as seen from one side, and (d) is as seen from the other side. (E) is a front view and (f) is a rear view.

  1 and 2, the diffraction grating holder 1 includes a pair of holding plates 2 and 3 (a pair of elastic support plates) and a support plate 4 (an elastic support plate).

  In the diffraction grating 5, the X direction (optical axis) of a laser beam emitted from a semiconductor laser (not shown), and a light incident surface 6 on which the laser beam enters and a light output surface 7 on which a diffracted beam exits are orthogonal ( It has a cylindrical formation provided to intersect. A central axis for rotating the diffraction grating 5 to adjust the diffraction direction of the diffraction grating 5 is provided in the same direction as the X direction. Further, the diffraction grating 5 has a length X (r) in the X direction, and the light incident surface 6 and the light emitting surface 7 are circular with a radius Y (r).

  Of the pair of holding plates, one holding plate 2 is a Z that is perpendicular to the X direction and the X direction and the Y direction from the portions A and B at both ends of the upper side of the support plate 4 in the Y direction perpendicular to the X direction. The holding plates 2A and 2B are provided to extend in the direction. The holding plate 2A has a length X (a) in the X direction from the portion A, and is provided with a predetermined length in the Z direction. The holding plate 2B has a length X (a) in the X direction from the part B, and is provided with a predetermined length in the Z direction. Further, a space J is provided between the holding plates 2A and 2B, and projecting pieces E and F that are opposed to each other with a slight gap K are provided.

  Similarly, the other holding plate 3 is provided to extend in the X direction and the Z direction from the portions C and D at both ends of the lower side of the support plate 4 in the Y direction, and has a length X (b ) It is formed by a circular ring (adjustment hole) having a length longer than the length X (r) of the diffraction grating 5 in the X direction. Further, the maximum diameter (the length with the longest Z (b)) of the inner surface of the ring of the holding plate 3 is set smaller than the diameter 2Y (r) of the light incident surface 6. In addition, although the shape of the ring of the other holding | maintenance board 3 is circular, it is not restricted to this. The ring shape may be any shape such as an ellipse or a polygon as long as the diffraction direction of the diffraction grating 5 can be adjusted and the diffraction grating 5 can be held.

  On the other hand, the support plate 4 has a length Y (c) in the Y direction and a length Z (c) in the Z direction. The support plate 4 is provided with an optical path hole 8 through which a laser beam emitted from a semiconductor laser (not shown) enters the diffraction grating 5 in the X direction. The optical path hole 8 has a circular shape with a radius R (the length of 2R is shorter than Y (c) and Z (c)). Further, the support plate 4 has an elastic force to press the diffraction grating 5 by being curved at a substantially central portion I in the Y direction while projecting in the direction in which the diffraction grating 5 is attached (for example, a plate). Spring). The support plate 4 can elastically press the light incident surface 6 of the diffraction grating 5 in the X direction in a state where the light exit surface 7 is fixed to a housing (not shown). In addition, although the shape of the optical path hole 8 is circular, it is not restricted to this. The shape of the optical path hole 8 has a size that allows a laser beam from a semiconductor laser (not shown) to pass therethrough, has a strength capable of supporting the pair of holding plates 2 and 3, and is incident on the diffraction grating 5. Any shape such as an ellipse or a polygon may be used as long as it has a shape capable of pressing the surface 6 from the X direction.

  However, since the diffraction grating holder 1 composed of the pair of holding plates 2 and 3 and the support plate 4 needs to sandwich the diffraction grating 5, X (a) + Y (c) + X ( The length b) is longer than the diameter 2Y (r) of the light incident surface 6. Y (c) is provided with a length shorter than the diameter 2Y (r) of the light incident surface 6 because the diffraction grating 5 is dropped into the ring of the other holding plate 3 and held.

  The pair of holding plates 2 and 3 are provided on the same plane in the X direction and the Z direction, and are provided so as to elastically hold the diffraction grating 5 in the Y direction. At this time, the diffraction grating 5 is elastic in the vicinity of the center in the Z direction on the peripheral surface (periphery) of the diffraction grating 5 by the projecting portions E and F provided on the holding plates 2A and 2B forming the one holding plate 2. The parts G and H are elastically pressed toward the central axis of the diffraction grating 5 by bending the parts G and H with the parts A and B as fulcrums. Similarly, the other holding plate 3 elastically holds the peripheral surface (periphery) of the diffraction grating 5 in the Z direction with the portions C and D as fulcrums. Therefore, the elastic holding of the diffraction grating 5 by the diffraction grating holder 1 formed from the pair of holding plates 2 and 3 and the support plate 4 is ensured. Further, the strength of the other holding plate 3 that elastically holds the peripheral surface (periphery) of the diffraction grating 5 becomes larger as the length Z (c) in the Z direction becomes longer. The pair of holding plates 2 and 3 are provided in parallel in the X direction and the Z direction, but are not limited thereto. For example, one holding plate 2 is provided so as to be slightly inclined in the −Y direction as it extends in the X direction and / or is inclined slightly in the + Y direction as the other holding plate 3 is extended in the X direction. May be. Thereby, the elastic holding force of the pair of holding plates 2 and 3 with respect to the diffraction grating 5 can be further strengthened.

=== Configuration of Optical Head Device ===
The optical head device according to the present invention will be described with reference to FIGS. 3 to 7 are perspective views showing an optical head device according to the present invention. Specifically, FIG. 3 is an exploded perspective view showing a state before the diffraction grating 5 and the washer 12 are incorporated into the housing 10 and elastically held using the diffraction grating holder 1. FIG. 4 is a perspective view showing a state in which the diffraction grating 5 is incorporated into the housing 10 and elastically held using the diffraction grating holder 1. FIG. 5 is a perspective view of the housing 10 shown in FIG. 4 viewed from the −Y direction. FIG. 6 is a perspective view showing a state before the semiconductor laser 15 is assembled and held in the housing 10 shown in FIG. FIG. 7 is a perspective view showing a state in which the semiconductor laser 15 held by the laser holder 18 is incorporated and held in the housing 10 shown in FIG.

<< Configuration of Optical Head Device >>
The housing 10 of the optical head device according to the present invention is provided with an actuator installation section 11, a diffraction grating installation section 13, and a semiconductor laser installation section 16, and has a pair of locking sections 14 and a locking section 19. .

  For example, an objective lens (not shown) that irradiates a recording medium or the like (not shown) and an actuator (not shown) that drives the objective lens are installed in the actuator installation unit 11.

  The diffraction grating installation unit 13 is provided so that the diffraction grating 5 and the washer 12 are incorporated. The diffraction grating installation unit 13 is configured to allow the diffraction beam formed by diffracting the laser beam by the diffraction grating 5 to enter the housing 10 in the X direction (optical axis) of the laser beam emitted from the semiconductor laser 15. A diffraction beam incident hole 17 is provided. The shape of the diffraction beam incident hole 17 is, for example, a circle having a shorter radius than the radius X (r) of the diffraction grating 5. Further, the diffraction grating installation portion 13 has a length equal to or longer than the sum of the length X (r) of the diffraction grating 5 and the width of the washer in the X direction, and is diffracted in the Y direction orthogonal (crossing) the X direction. The grating 5 has a length equal to or smaller than the diameter 2Y (r), and has a length equal to or larger than the diameter 2Y (r) of the diffraction grating 5 in the X direction and the Z direction orthogonal to (intersects) the Y direction. Although the shape of the diffraction beam incident hole 17 is circular, it is not limited to this. The diffraction beam incident hole 17 may have any shape such as an ellipse or a polygon as long as the diffraction beam formed by diffracting the laser beam emitted from the semiconductor laser 15 by the diffraction grating 5 passes therethrough. good.

  The washer 12 is provided to prevent loosening when the diffraction grating 5 incorporated in the diffraction grating installation portion 13 is elastically held in the X direction by the diffraction grating holder 1. The washer 12 is provided in a circular shape having a radius Y (r) and is provided with a width capable of preventing relaxation in the X direction. In addition, a hole for allowing the laser beam emitted from the semiconductor laser 15 to enter the diffraction grating 5 in the X direction is provided. The shape and the hole of the washer 12 are not limited to a circle. Any shape may be used as long as it has a width that can prevent loosening between the diffraction grating 5 and the diffraction grating holder 1 and has a size through which the laser beam emitted from the semiconductor laser 15 passes.

  The pair of locking portions 14 provided on the surface of the housing 10 on the + Y direction side has a predetermined length in the Z direction, changes to the + Y direction as it advances a predetermined distance in the + X direction, and further proceeds in the + X direction. And a nail shape that changes sharply in the -Y direction.

  The locking portion 19 provided on the surface on the −Y direction side of the housing 10 changes in the −Y direction as it advances a predetermined distance in the + X direction, and further changes sharply in the + Y direction as it advances in the + X direction. Have The locking portion 19 having a claw shape is provided so as to be fitted into the ring of the other holding plate 3 formed in the circular ring (adjustment hole). It has a circular hole for adjusting the diffraction direction. In addition, the shape of the latching | locking part 19 is not restricted to a shape as FIG. 5, What kind of shape may be sufficient if it is a shape which fits the shape of the other holding | maintenance board 3. FIG. The hole for adjusting the diffraction direction of the diffraction grating 5 is circular, but is not limited thereto. Any shape is possible as long as the diffraction direction of the diffraction grating 5 can be adjusted.

<< Elastic Holding Method of Diffraction Grating 5 to Housing 10 Using Diffraction Grating Holder 1 >>
The diffraction grating 5 is dropped into the diffraction grating installation part 13 provided in the housing 10 in the −Y direction as indicated by the alternate long and short dash line in the Y direction of FIG. 3. At this time, the light exit surface 7 of the diffraction grating 5 faces the + X direction and the light entrance surface 6 faces the −X direction, so that the diffraction grating 5 is dropped into the diffraction grating installation portion 13.

  Further, the diffraction grating installation unit 13 is configured such that when the diffraction grating 5 and the washer 12 are dropped, the center of the diffraction beam incident hole 17, the center of the light exit surface 7, the center of the light incident surface 6, and the washer 12. The center of the hole provided in is formed so as to be provided on the same axis as the X axis of the laser beam emitted from the semiconductor laser 15.

  After the diffraction grating 5 and the washer 12 are provided in the diffraction grating installation part 13, the diffraction grating holder 1 moves in the + X direction as shown by the one-dot chain line in the X direction in FIG. As a result, the diffraction grating 5 is elastically held in the housing 10.

  At this time, the surface in the −Y direction of one holding plate 2 of the diffraction grating holder 1 comes into contact with the locking portion 14 provided in the housing 10 as the diffraction grating holder 1 moves in the + X direction. Then, as the diffraction grating holder 1 advances in the + X direction, one holding plate 2 is pushed up in the + Y direction against the elastic force while riding on the locking portion 14 from the side on the + X direction side. Further, when the diffraction grating holder 1 advances in the + X direction, and one holding plate 2 finishes moving the length of the locking portion 14 in the X direction, it returns to the −Y direction by elastic force. At this time, the peripheral surface (periphery) in the + Y direction of the diffraction grating 5 is moved closer to the center in the Z direction on the peripheral surface (periphery) of the diffraction grating 5 by the protruding pieces E and F provided on one holding plate 2. It is elastically pressed by the elastic force. Further, the diffraction grating 5 is elastically pressed toward the central axis of the diffraction grating 5 by bending the parts G and H of one holding plate 2 with the parts A and B as fulcrums. Further, one holding plate 2 elastically presses the diffraction grating 5, and the portions 2C and 2D of the one holding plate 2 are caught by the locking portion 14, and the one holding plate 2 is locked to the housing 10 (FIG. 4).

  Similarly, the surface in the + Y direction of the other holding plate 3 of the diffraction grating holder 1 comes into contact with a locking portion 19 provided in the housing 10 when the diffraction grating holder 1 moves in the + X direction. As the diffraction grating holder 1 advances in the + X direction, the other holding plate 3 is pushed up in the −Y direction against the elastic force while riding on the locking portion 19 from the side on the + X direction side. Further, when the diffraction grating holder 1 advances in the + X direction and the other holding plate 3 finishes moving the length of the locking portion 19 in the X direction, it returns to the + Y direction by the elastic force. That is, the engaging portion 19 is fitted to the circular ring of the other holding plate 3, and the other holding plate 3 is engaged with the housing 10 (FIG. 5). At this time, the ring (adjustment hole) forming the other holding plate 3 and the hole for adjusting the diffraction direction of the diffraction grating 5 provided in the locking portion 19 are provided on the same axis in the Y direction. A part of the peripheral surface (periphery) of the diffraction grating 5 is provided so as to be visible from the -Y direction.

  Further, the support plate 4 of the diffraction grating holder 1 moves the diffraction grating holder 1 in the + X direction in a state where the light exit surface 7 is fixed to the surface of the housing 10 in which the diffraction beam incident hole 17 is provided. As a result, the curved portion provided at the substantially central portion I of the support plate 4 contacts the washer 12. As the diffraction grating holder 1 advances in the + X direction, the washer 12 is elastically pressed, and the washer 12 elastically presses the light incident surface 6 of the diffraction grating 5. When one holding plate 2 is locked to the housing 10 by the locking portion 14 and the other holding plate 3 is locked to the housing 10 by the locking portion 19, the support plate 4 presses the washer 12 in the + X direction. Stop. Therefore, the diffraction grating holder 1 can elastically hold the diffraction grating 5 in the housing 10.

  In FIG. 6, the center of the optical path hole 8 provided in the support plate 4 of the diffraction grating 5 and the diffraction grating holder 1 incorporated in the housing 10, the center of the hole provided in the washer 12, and the light incident surface 6. The center, the center of the light exit surface 7, and the center of the diffraction beam incident hole 17 are provided on the same axis on the X axis. The semiconductor laser 15 is provided so as to emit a laser beam in the + X direction on the X axis of the semiconductor laser installation portion 16. Therefore, the surface in the −X direction of the support plate 4 and the laser output hole (not shown) of the semiconductor laser 15 are provided facing each other on the X axis, and the semiconductor laser 15 is positioned. Further, since the semiconductor laser 15 is fixed to the housing 10 while maintaining the position, it is held by the laser holder 18. The laser holder 18 holds the semiconductor laser 15 and fixes the surface of the housing 10 that contacts the semiconductor laser installation portion 16 with, for example, an adhesive (for example, UV adhesive).

  According to the above-described embodiment, it is not necessary to use a spring member, a pressing plate, a set screw, or the like in the operation of assembling the diffraction grating 5 into the housing 10 in the manufacturing process of the optical head device, and only the diffraction grating holder 1 and the washer 12 are used. Since the assembling work becomes possible, the manufacturing cost is reduced and the assembling work becomes easy. Furthermore, also about the cancellation | release of the state in which the diffraction grating 5 was being fixed to the housing 10, the one holding plate 2 caught on the latching | locking part 14 is raised to + Y direction, and the other holding plate fitted to the latching | locking part 19 is carried out. 3 is lowered in the -Y direction and the diffraction grating holder 1 is moved in the -X direction, the elastic holding state of the diffraction grating 5 of the diffraction grating holder 1 can be released, and the set screw or the like need not be removed. Also, releasing the fixed state is an easy task. The diffraction direction of the diffraction grating 5 is adjusted by inserting a diffraction direction adjustment member (not shown) into a through-hole (not shown) provided in the housing 10 and engaging with the diffraction grating 5. Although it is performed by rotating around a moving axis (same axis as the laser beam emitted from the semiconductor laser 15), a force to be applied only to rotate the diffraction grating 5 is essentially a diffraction direction adjusting member. By engaging the diffraction grating 5 (not shown) with the diffraction grating 5, a force is applied in a direction orthogonal to the rotation axis when the diffraction grating 5 rotates, and the diffraction grating 5 itself may be displaced. According to the embodiment, the diffraction grating 5 is elastically held by the diffraction grating holder 1 by elastic pressing in the central axis direction of the diffraction grating 5 by one holding plate 2 and in the + Y direction of the diffraction grating 5 by the other holding plate 3. Elastic pressing of the support plate 4 Since the folding grating 5 is elastically pressed in the + X direction, the diffraction grating 5 is elastically held more securely than the conventional technique in which the diffraction grating 5 is held only in the X direction, and the diffraction grating 5 has a diffraction direction adjusting member (not shown). The displacement of the diffraction grating 5 can be suppressed.

=== Other Embodiments ===
In the above, the incorporation of the diffraction grating and the semiconductor laser into the housing of the optical head device according to the present invention has been described. However, the above description is intended to facilitate understanding of the present invention and is intended to limit the present invention. is not. The present invention can be changed and improved without departing from the gist thereof.

=== Other Embodiments ===

It is a perspective view which shows schematic structure of the diffraction grating holder which concerns on this invention. FIG. 6 is a hexahedral view illustrating a schematic configuration of a diffraction grating holder according to the present invention. 1 is an exploded perspective view showing an embodiment of an optical head device according to the present invention. 1 is a perspective view showing an embodiment of an optical head device according to the present invention. 1 is a perspective view showing an embodiment of an optical head device according to the present invention. 1 is a perspective view showing an embodiment of an optical head device according to the present invention. 1 is a perspective view showing an embodiment of an optical head device according to the present invention. It is a figure which shows the prior art of the integration | attachment of the diffraction grating to the housing of an optical head apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diffraction grating holder 2, 3 Holding plate 4 Support plate 5 Diffraction grating 6 Light incident surface 7 Light exit surface 8 Optical path hole 9 Through hole 10 Housing 11 Actuator installation part 12 Washer 13 Diffraction grating installation part 14, 19 Locking part 15 Semiconductor Laser 16 Semiconductor laser installation part 17 Diffraction beam entrance hole 18 Laser holder 19 Cylindrical hole 20 Spring member 21 Press plate 22 Set screw 23 Through hole

Claims (2)

A diffraction grating holder that holds a diffraction grating that diffracts incident light and is engaged with a housing,
A pair of elastic holding plates for elastically holding the periphery of the diffraction grating in a direction intersecting the optical axis of the incident light, and locking the housing at a locking position of the diffraction grating with respect to the housing;
The incident light has an optical path hole for entering the diffraction grating, supports between the pair of elastic holding plates, and places the diffraction grating at the position where the diffraction grating is locked with respect to the housing. An elastic support plate that is elastically pressed from the light incident side;
Equipped with a,
One elastic holding plate of the pair of elastic holding plates has a diffraction direction adjusting member for adjusting a diffraction direction of the diffraction grating inserted through a through hole of the housing at a position where the elastic holding plate is engaged with the housing. A diffraction grating holder having an adjustment hole for the purpose . A semiconductor laser, a diffraction grating that diffracts a laser beam emitted from the semiconductor laser, a housing in which the semiconductor laser and the diffraction grating are incorporated, and a diffraction grating holder that holds the diffraction grating and engages the housing An optical head device comprising:
The diffraction grating holder is
A pair of elastic holding plates for elastically holding the periphery of the diffraction grating in a direction intersecting an optical axis of a laser beam emitted from the semiconductor laser, and locking the housing at a locking position of the diffraction grating with respect to the housing; ,
The laser beam emitted from the semiconductor laser has an optical path hole for entering the diffraction grating, supports between the pair of elastic holding plates, and at the position where the diffraction grating is locked with respect to the housing. An elastic support plate that elastically presses the grating from the incident side of the laser beam emitted from the semiconductor laser,
The housing is
A locking member for locking the pair of elastic holding plates at a locking position of the pair of elastic holding plates with respect to the housing;
A through hole into which a diffraction direction adjusting member for adjusting the diffraction direction of the diffraction grating is inserted, and
One elastic retaining plate of the pair of elastic holding plate, in the locking position with said housing, having an adjusting hole for previous Machinery folding direction adjusting member is inserted through the through hole of the housing An optical head device .

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