JP2008084360A - Fixing structure of grating lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify assembling of a grating lens, to improve the work efficiency to reduce the cost, and to stabilize a fixing system of the grating lens to improve the reliability. <P>SOLUTION: A triangular recessed guide groove 3b is formed on an outer peripheral wall of a grating lens 3. With respect to a slide base 1, a projecting guide rail 2a having an approximately semicircular shape, which is to be fitted to the recessed guide groove, is provided on an inner wall of an opening 2 which has an approximate U shape in a top view, and a spherical member 5 which is partially projected outward by a pressing force of a compression spring 4 is disposed in the inner wall of the opening. When the grating lens is fitted to the opening of the slide base, the recessed guide groove of the grating lens is fitted to the projecting guide rail in the opening of the slide base and is slid to the depth of the opening, and in this state, the spherical member in the inner wall of the opening is projected outward elastically by the pressing force of the compression spring and is brought into contact with the outer peripheral wall of the grating lens to fix the grating lens. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  According to the present invention, a substantially U-shaped opening in a plan view is provided in a slide base of an optical pickup, and a substantially circular grating lens in a plan view provided with an adjustment notch is fitted into the opening and fixed. The present invention relates to a grating lens fixing structure.

  The conventional fixing structure of this type of grating lens is difficult to assemble the grating lens to the slide base, and there is a problem that the fixing accuracy is insufficient due to the structural gap between the slide base and the grating lens. was there.

  The first prior art is shown in FIGS. 5 (a), 5 (b) and 5 (c). As shown in FIGS. 5A, 5B, and 5C, this conventional integrated optical system is an optical device in which a light source that generates light, a main light detector 117 that receives light, and a monitor light detector 119 are arranged. Optical path separation for separating the optical path of the bench 110, the lens unit 170 coupled to the optical bench 110, the light emitted from the light source 115 and traveling to the lens unit 170 side, and the light traveling and incident from the lens unit 170 side The first mirror 131 that switches the traveling direction of the light emitted from the member 150 and the light source 115 and is directed to the lens unit 170 side, and the light that is incident from the lens unit 170 side and reflected by the first mirror 131. An optical path forming unit 130 that includes a second mirror 135 that switches the traveling direction and faces the main light detector 117 and is coupled to the optical bench 110 is provided. Further, a recess 125 is formed in the optical bench 110, and the optical path separation member 150 is installed in the recess 125. (For example, refer to Patent Document 1).

  However, in this case, the concave portion 125 and the optical separation member 150 do not have a concave groove and a convex portion.

  The second prior art is shown in FIGS. In this conventional optical pickup device, as shown in FIGS. 6 and 7, the diffraction gratings 230 and 240 are attached to holders 232 and 242 made of thin metal plates, and a pair of pressing pieces 251 and 253 of a plate spring 250 are used. The inner wall surfaces 211a and 212a of the metal block base 221 are urged and held. The sliding end surfaces 237 and 247 of the holders 232 and 242 are in contact with the sliding surfaces 211b and 212b of the block base 221, and the diffraction gratings 230 and 240 are rotatably supported with respect to the block base 221. Yes. This makes it possible to reduce the thickness and size of the optical pickup device and to easily adjust the angle of the diffraction grating. Further, the glass substrates 231 and 241 are attached to the holders 232 and 242. (For example, refer to Patent Document 2).

However, in this case, there is no stopper for fixing the glass substrates 231 and 241.
JP 2005-346903 A JP 2005-285166 A

  The present invention has been made in view of the above-described conventional problems, and can simplify the assembling work of the grating lens, improve the working efficiency, reduce the cost, and fix the grating lens. It is an object of the present invention to provide a grating lens fixing structure that can improve the reliability of the grating lens.

  The present invention has been proposed in order to solve the above-mentioned problems, and the invention according to claim 1 is characterized in that a substantially U-shaped opening in a plan view is provided in a slide base of an optical pickup, and an adjustment notch is provided. A grating lens fixing structure in which a substantially circular grating lens in plan view is provided and fixed in the opening, and a triangular concave guide groove is formed on an outer peripheral wall of the grating lens, and the slide The base is provided with a convex guide rail having a substantially semicircular cross-section to be fitted in the concave guide groove on the inner wall of the opening, and a part of the outer side of the inner wall of the opening by the biasing force of the compression spring. A spherical body projecting into the opening of the slide base when the grating lens is fitted into the opening of the slide base. The groove is fitted to the convex guide rail of the opening of the slide base and is slid to the inner part of the opening. In this state, the spherical body in the inner wall of the opening is elastically outward by the biasing force of the compression spring. The spherical lens is brought into contact with the outer peripheral wall of the grating lens so that the grating lens is fixed in the opening of the slide base.

  According to the second aspect of the present invention, an opening having a substantially U shape in plan view is provided in the slide base of the optical pickup, and a substantially circular grating lens in plan view having an adjustment notch is fitted into the opening. In the fixing structure of the grating lens that is fixed, the grating lens is slid and fitted into the opening of the slide base by a concave-convex fitting, and the grating lens is fitted into the opening of the slide base It is characterized by being fixed by a fixing member.

  The invention according to claim 3 is the invention according to claim 2, wherein the concave-convex fitting structure includes a convex portion having a substantially semicircular cross section provided on an outer peripheral wall of the grating lens, and an opening of the slide base. It is comprised from the triangular concave guide groove provided in the inner peripheral wall of the part.

  According to a fourth aspect of the present invention, in the invention according to the second or third aspect, the fixing member is an adhesive placed in a gap between an opening of the slide base and a grating lens fitted in the slide base. It consists of

  According to a fifth aspect of the invention, in the invention of the second or third aspect, the fixing member is provided on the slide base, and the grating lens is removed in a state where the grating lens is fitted into the opening of the slide base. It consists of a stopper member for stopping and fixing.

  The invention according to claim 6 is the invention according to claim 5, wherein the stopper member is screwed into the slide base and screwed into the opening of the grating lens. It is comprised with the screw contact | abutted to an outer peripheral wall.

  According to the first aspect of the present invention, the grating lens is fitted into the convex guide rail provided in the opening of the slide base and the concave guide groove provided in the grating lens is fitted to the opening of the slide base. Since it is slid to the inner part, the assembling work can be simplified, the working efficiency can be improved, and the cost can be reduced. Further, since the triangular concave guide groove is in contact with the convex guide rail having a substantially semicircular cross section, the contact area is small, and the sliding of the grating lens with respect to the opening of the slide base can be performed smoothly. In addition, after fitting the grating lens to the back of the opening of the slide base, the spherical body abuts against the outer peripheral wall of the grating lens by the urging force of the compression spring, and the grating lens is fixed. And reliability can be improved.

  According to the second aspect of the present invention, since the grating lens is slid and fitted into the opening of the slide base by the concave-convex fitting, the assembling work can be simplified and the working efficiency can be improved. Cost reduction can be achieved. Further, since the grating lens is fixed by the fixing member while being fitted in the opening of the slide base, the fixing accuracy can be stabilized and the reliability can be improved.

  According to the third aspect of the present invention, the concave / convex fitting structure is provided on the convex portion having a substantially semicircular cross section provided on the outer peripheral wall of the grating lens and the inner peripheral wall of the opening portion of the slide base. Since it is comprised from the triangular concave guide groove, an assembly operation can be simplified further and work efficiency can be improved. Further, since the concave guide groove is provided in the inner peripheral wall of the opening portion of the slide base, there is an advantage that a conventional grating lens can be attached to the opening portion of the slide base.

  According to the fourth aspect of the invention, since the fixing member is made of an adhesive, the grating lens can be firmly fixed to the opening of the slide base by the adhesive.

  According to the fifth aspect of the invention, since the fixing member is constituted by the stopper member, the grating lens can be stably fixed to the opening of the slide base.

  According to the sixth aspect of the present invention, since the stopper member is made of a screw, the stopper member can be provided at a low cost. Further, the grating lens can be more firmly fixed in the opening by the screw.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a grating lens fixing structure according to the present invention will be described with reference to the drawings.

  1A and 1B show a fixing structure of a grating lens according to a first embodiment of the present invention, FIG. 1A is an exploded perspective view thereof, FIG. 1B is a plan view showing a state when the assembly is completed, and FIG. It is a top view of the state fixed with the adhesive agent in the state of).

  As shown in FIG. 1A, the grating lens fixing structure of the first embodiment is provided with a substantially U-shaped opening 2 in a plan view on a slide base 1 of an optical pickup and an adjustment notch 3a. The grating lens 3 having a substantially circular shape in plan view is fitted. A triangular concave guide groove 3b is formed on the outer peripheral wall of the grating lens 3 at the center in the thickness direction. On the other hand, a convex guide rail 2a having a substantially semicircular cross section is provided on the inner wall of the opening 2 of the slide base 1 and is fitted into the concave guide groove 3b. Further, a circular hole 2 c is formed in the inner wall of the opening 2, a compression spring 4 is disposed in the circular hole 2 c, and a spherical body 5 that is partially desired on the inner wall of the opening 2 is formed in the compression spring 4. It is arranged in a state of being urged outward by the urging force of. The tip of the grating lens 3 is formed in a shape cut into a flat shape.

  With the above configuration, when the grating lens 3 is fitted into the opening 2 of the slide base 1, the concave guide groove 3 b of the grating lens 3 is fitted into the convex guide rail 2 a of the opening 2 of the slide base 1. 2 is slid to the back. In this state, as shown in FIG. 1 (b), the spherical body 5 disposed in the circular hole 2 c on the inner wall of the opening 2 is projected outwardly with elasticity by the urging force of the compression spring 4. The body 5 comes into contact with the outer peripheral wall of the grating lens 3 and the grating lens 3 is fixed in the opening 2 of the slide base 1. In this state, as shown in FIG. 2, the adhesive 6 is injected into the opening 2 of the slide base 1, and the grating lens 1 is securely fixed in the opening 2.

  Therefore, according to the first embodiment, the grating lens 3 is in a state where the concave guide groove 3b provided in the grating lens 3 is fitted to the convex guide rail 2a provided in the opening 2 of the slide base 1. Since it slides in the inner part of the opening part 2 of the slide base 1, assembly work can be simplified, work efficiency can be improved, and cost reduction can be aimed at. Further, since the triangular concave guide groove 3b is in contact with the convex guide rail 2a having a substantially semicircular cross section, the contact area is small, and the grating lens 3 can be smoothly slid relative to the opening 2 of the slide base 1. Further, after the grating lens 3 is fitted to the back of the opening 2 of the slide base 1, the spherical body 5 abuts against the outer peripheral wall of the grating lens 3 by the urging force of the compression spring 4 to fix the grating lens 3. As a result, the fixing accuracy can be stabilized and the reliability can be improved. Further, the grating lens 3 can be firmly fixed to the opening 2 of the slide base 1 by the adhesive 6.

  3A and 3B show a fixing structure of a grating lens according to the second embodiment, wherein FIG. 3A is a plan view of a state in which a fixing screw is screwed in, and FIG. It is a top view of the state fixed with the agent.

  As shown in FIGS. 3A and 3B, the grating lens fixing structure according to the second embodiment has a female screw hole 7 drilled from the outer wall of the slide base 1 toward the inner wall of the opening 2. Screws 8 are screwed into the holes 7. When the screw 8 is screwed in after the grating lens 3 has been slid to the back of the opening 2 of the slide base 1, the tip of the screw 8 comes into contact with the outer peripheral wall of the grating lens 3 so that the grating lens 3 is in the opening 2. Fixed to. Further, the adhesive 6 is injected into the opening 2 to firmly fix the grating lens 3 in the opening 2.

  Therefore, according to the second embodiment, since the grating lens 3 is fixed in the opening 2 by the screws 8, an inexpensive structure can be achieved. Further, the grating lens 3 can be more firmly fixed in the opening 2 by the screws 8.

  FIG. 4 is an exploded perspective view showing the grating lens fixing structure of the fourth embodiment.

  As shown in FIG. 4, the grating lens fixing structure of the fourth embodiment is provided with a convex portion 3 c having a substantially semicircular cross section on the outer peripheral wall of the grating lens 3, and the inner peripheral wall of the opening 2 of the slide base 1. Is provided with a triangular concave guide groove 2 d, and the convex portion 3 c of the grating lens 3 is fitted into the concave guide groove 2 d of the opening 2 and is fixed by the spherical body 5.

  According to the fourth embodiment, the convex part 3 c having a substantially semicircular cross section provided on the outer peripheral wall of the grating lens 3 and the triangular concave guide groove 2 d provided on the inner peripheral wall of the opening 2 of the slide base 1. , The assembly work can be further simplified, and the work efficiency can be improved. Further, since the concave guide groove 2 d is provided on the inner peripheral wall of the opening 2 of the slide base 1, there is an advantage that a conventional grating lens can be mounted in the opening 2 of the slide base 1.

1 shows a grating lens fixing structure according to a first embodiment of the present invention, in which (a) is an exploded perspective view thereof, and (b) is a plan view showing a state when the assembly is completed. FIG. It is a top view of the state fixed with the adhesive agent in the state of FIG.1 (b). The grating lens fixing structure of the second embodiment is shown, (a) is a plan view of the state in which the fixing screw is screwed in, (b) is pressing the grating lens with the screw and fixing with an adhesive FIG. It is a disassembled perspective view which shows the fixation structure of the grating lens of 4th Embodiment. A conventional integrated optical system is shown, (a) is a schematic perspective view thereof, (b) is a schematic perspective view of a configuration of the optical bench, and (c) is a side view thereof. It is a perspective view which shows the state in the middle of the assembly of the conventional optical pick-up apparatus. FIG. 7 is an exploded perspective view of the optical pickup device shown in FIG. 6.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Slide base 2 Opening part 2a Convex guide rail 2c Circular hole 2d Concave guide groove 3 Grating lens 3a Adjustment notch 3b Concave guide groove 3c Convex part 4 Compression spring 5 Spherical body 6 Adhesive 7 Female screw hole 8 Screw

Claims (6)

  A grating lens in which a substantially U-shaped opening in plan view is provided in a slide base of an optical pickup, and a substantially circular grating lens in plan view provided with an adjustment notch is fitted and fixed in the opening. In the fixed structure, a triangular concave guide groove is formed on the outer peripheral wall of the grating lens, and a convex guide rail having a substantially semicircular cross section inserted into the concave guide groove is formed on the inner wall of the opening. And a spherical body partially protruding outward by the biasing force of the compression spring is disposed in the inner wall of the opening, and when the grating lens is fitted into the opening of the slide base, The concave guide groove of the grating lens is fitted into the convex guide rail of the opening of the slide base, and is slid on the back of the opening. In this state, the spherical body in the inner wall of the opening is projected elastically outward by the urging force of the compression spring, so that the spherical body abuts on the outer peripheral wall of the grating lens. A grating lens fixing structure, wherein the grating lens is fixed in the opening of the slide base.   A grating lens in which a substantially U-shaped opening in plan view is provided in a slide base of an optical pickup, and a substantially circular grating lens in plan view provided with an adjustment notch is fitted and fixed in the opening. In the fixing structure, the grating lens is slid and fitted into the opening of the slide base by concave and convex fitting, and the grating lens is fixed by the fixing member in a state of being fitted into the opening of the slide base. A grating lens fixing structure characterized by that.   The concave-convex fitting structure is composed of a convex part having a substantially semicircular cross section provided on the outer peripheral wall of the grating lens and a triangular concave guide groove provided on the inner peripheral wall of the opening of the slide base. The grating lens fixing structure according to claim 2.   4. The grating lens fixing structure according to claim 2, wherein the fixing member is made of an adhesive placed in a gap between an opening of the slide base and a grating lens fitted into the opening of the slide base. 5.   4. The grating lens according to claim 2, wherein the fixing member includes a stopper member that is provided on the slide base and that prevents the grating lens from being detached and fixed in a state in which the grating lens is fitted in the opening of the slide base. 5. Fixed structure.   The grating according to claim 5, wherein the stopper member is configured by a screw that abuts on an outer peripheral wall of the grating lens that is screwed into the slide base and screwed into the opening portion of the slide base. Lens fixing structure.