JP2007200403A - Optical pickup - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup protecting the light receiving surface of its light volume detecting element and easy to assemble saving its material costs. <P>SOLUTION: A groove 19 is formed by cutting the erected frame 4 from its top 4b down to the recess 11 on a sliding base 3 to open the top 11b of the recess 11. A reference frame 20 is integrally projected to block the bottom 11a of the recess 11 on the other surface 3b of the sliding base 3. A connection lever 15 is formed in one body with the sliding base 3 along the erected frame 4 and crossing the through hole 5. The distance α between the connection lever 15 and the erected frame 4 is set a little larger than the sum of the thickness t1 of the auxiliary substrate 10 and the thickness t2 of the support substrate 9. By folding double the tip end of the flexible printed circuit board 8 and inserting the support substrate 9 and the auxiliary substrate 10 in contact with each other between the connecting lever 15 and the erected frame 4, the light receiving element PD 2 for detecting the light volume is fitted in the recess 11 through the groove 19 of the recess 11 and positioned by contacting to the reference frame 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an optical pickup used in a disk device (for example, a DVD recorder or a DVD player), and in particular, protects the light-receiving surface of a light-receiving element for detecting the amount of light so that assembly work is easy and material costs are low. It is.

Conventionally, there is a description of Patent Document 1 as an optical pickup technique. An example of the technique will be described with reference to FIGS. 8 to 15. As shown in FIG. 8, a disk D arranged in the housing 1.
The metal slide base 3 is reciprocated between a pair of left and right guide rails 2 along the radial direction of
The upright frame 4 is integrally formed on one surface (back surface) 3a of the front and back both surfaces 3a, 3b of one end of the slide base 3 and is pulled out to the other end of the slide base 3. A hole 5 is formed adjacent to the upright frame 4. A reading light-receiving element PD 1 made of a photodiode and a laser light source LD made up of a laser diode are arranged in the upright frame 4, and a polarization beam splitter is placed in the upright frame 4. A PBS, a half mirror HM, and an objective lens OL are arranged.

To explain the information reading procedure, a laser beam is projected from the laser light source LD to the disk D that rotates at high speed through the polarization beam splitter PBS, the half mirror HM, and the objective lens OL.
The reflected light is received by the reading light receiving element PD1 through the objective lens OL, the half mirror HM, and the polarization beam splitter PBS, and the information recorded on the disk D is read.

As shown in FIGS. 9 to 11, a light amount detection light-receiving element PD <b> 2 made of a photodiode is attached to the tip of a flexible printed wiring 8 extending from the control board 7 fixed to the slide base 3 via a support board 9, An auxiliary substrate 10 with a capacitor is attached at a position slightly away from the support substrate 9 in the vicinity of the tip of the flexible printed wiring 8.

Further, the hole facing surface 4a of the upright frame 4 has a pair of left and right vertical beams 14a, 14b and a horizontal beam 14c.
The center of the recess 11 surrounded by the vertical beams 14a, 14b and the horizontal beam 14c is an element storage space 12 for storing the light-receiving element PD2 for light quantity detection. Both sides in the recess 11 are a pair of left and right terminal storage spaces 13 for storing terminals (not shown) of the light receiving element PD2 for detecting the light amount, and the bottom surface 11a of the recess 11 is the other surface (surface) of the slide base 3. ) 3b, and the ceiling surface 11b of the recess 11 is closed by a cross beam 14c. In FIG. 11, reference numeral 15 denotes a slide base 3 that is integrally formed with a punch hole 5 along the standing frame 4.
And a space α between the connecting rod 15 and the upright frame 4 is sufficiently wide.

The assembly procedure will be described. As shown by a two-dot chain line in FIG.
The support substrate 9 is brought into contact with the auxiliary substrate 10 by folding the front end portion of the substrate, and the flexible printed wiring 8 is bent as shown in FIG. As a result, the light quantity detection light receiving element PD2 passes over the cross beam 14c and is fitted into the recess 11, and as shown in FIGS. 12 to 15, the light quantity detection light receiving element P is placed on the ceiling surface 11b of the recess 11.
D2 is applied and positioned, and the state is fixed with a jig (not shown). Then, FIG.
As shown in FIG. 15, an ultraviolet curable adhesive UV is applied to a plurality of locations (two locations in this example) between the support substrate 9 and the upright frame 4 (and the slide base 3), and then irradiated with ultraviolet rays. Adhesive U
By curing V, the support substrate 9 is bonded to the upright frame 4 and the jig is removed.

The procedure for detecting the amount of light will be described. The amount of light projected from the laser light source LD is detected by the light receiving element PD2 for detecting the amount of light through the light passage hole 17 (see FIG. 14) penetrating the back wall of the recess 11, and the disc is detected based on the detected signal. The projection light quantity of the laser light source LD is adjusted by the control unit of the apparatus.
JP 2004-348779 A

In the above-described conventional configuration, the flexible printed wiring 8 is bent and the support substrate 9 is inserted into the hole 5 at the time of assembly so that the light receiving element PD2 for detecting the light quantity gets over the cross beam 14c and is fitted in the recess 11. In the case of overcoming the light receiving element P for detecting the amount of light
The light receiving surface of D2 comes into contact with the cross beam 14c and is damaged, or dust adheres to the light receiving surface to reduce the amount of received light. As a result, an erroneous detection signal is input to the control unit, thereby causing the laser light source LD. The amount of projection light increases excessively, and the laser light source LD is overheated, which may reduce its performance or shorten its life.

Further, the light quantity detecting light receiving element PD2 is only restricted from moving from one direction by the cross beam 14c, and does not move in the vertical directions c and d in FIG. 14, but in the horizontal directions e and h. Is free to move, the light quantity detection light-receiving element PD2 may move in the direction of the arrow f toward the hole 5 and be separated from the standing frame 4. Therefore, a jig is required to prevent the light receiving element PD2 for detecting the light amount from unexpectedly moving, and the support substrate 9 and the upright frame 4 (and the slide base 3).
) Is applied to a plurality of locations (in this example, two locations), so that the light quantity detection light-receiving element PD2 is separated from the upright frame 4 and does not move toward the extraction hole 5 side. In this case, since the number of times of application is increased, the assembly work is troublesome and troublesome, and the amount of the adhesive UV used is large and the material cost is high.

An object of the present invention is to provide an optical pickup that protects the light-receiving surface of a light-receiving element for light quantity detection, facilitates assembly work, and reduces material costs.

In order to achieve the above object, according to the first aspect of the present invention, an upright frame is integrally formed on one surface of the front and back surfaces on one end side of the slide base that can reciprocate along the radial direction of the disk. A hole is formed adjacent to the upright frame on the other end side of the slide base, and a light receiving element for reading and a laser light source are arranged on the upright frame, and laser light is projected from the laser light source onto the disk. Then, the reflected light is received by the reading light receiving element and the information recorded on the disk is read, and a flexible printed wiring extending from the control board fixed to the slide base is attached to the front end of the flexible printed wiring via a support board. A light receiving element for detecting the amount of light
A recess is formed on the surface of the standing frame facing the hole, and the bottom surface of the recess is open to the other surface of the slide base, and the flexible printed wiring is bent to insert the support substrate into the hole. The light-receiving element for detecting light amount is fitted into the recess from the open bottom surface of the recess, and the light-receiving element for detecting light amount is applied and positioned on the ceiling surface of the recess, and then the support substrate is adhered to the standing frame with an adhesive, Thus, in the optical pickup in which the light quantity detection light receiving element detects the amount of light emitted from the laser light source through the light passage hole provided in the inner wall of the concave portion, the standing frame is extended from the top surface of the standing frame to the concave portion. A notch groove is formed to open the ceiling surface of the recess, and a reference frame for closing the bottom surface of the recess is integrally projected on the other surface of the slide base. The auxiliary substrate on the end vicinity is secured, connecting rod crossing the hole punching along the upright frame is formed integrally with the slide base, the spacing between the connecting rods and the standing frame,
The total thickness of the auxiliary substrate and the support substrate is set to be slightly larger, and the support substrate and the auxiliary substrate brought into contact with each other by folding the tip of the flexible printed wiring in two are By inserting between the connecting rod and the standing frame, the light quantity detecting light receiving element is fitted into the concave part from the notch groove of the concave part, and the light quantity detecting light receiving element is applied to the reference frame for positioning. It is characterized by.

According to a second aspect of the present invention, an upright frame is integrally formed on one of the front and back surfaces of one end of the slide base that can reciprocate along the radial direction of the disk, and the other end of the slide base. A punched hole is formed adjacent to the upright frame on the side, and a light receiving element for reading and a laser light source are arranged on the upright frame, and a laser beam is projected from the laser light source onto the disk, and the reflected light is projected onto the disc. A light receiving element for detecting light quantity is formed at the front end of a flexible printed wiring extending from a control board fixed to the slide base and received by a light receiving element for reading through a support board. A concave portion is formed on the surface of the standing frame facing the hole, and the amount of light is detected by bending the flexible printed wiring and inserting the support substrate into the hole. After positioning the light receiving element in the recess, the support substrate is adhered to the upright frame with an adhesive, thereby detecting the amount of light emitted from the laser light source through the light passage hole penetrating the back wall of the recess. In the optical pickup that is detected by the light receiving element for use, a notch groove is formed in the other surface of the slide base by forming the notch from the top surface of the standing frame to the recess and opening the ceiling surface of the recess. A reference frame that closes the bottom surface of the recess is integrally protruded, and the light amount detection light-receiving element fitted in the recess from the notch in the recess is applied to the reference frame for positioning. .

According to a third aspect of the present invention, in the second aspect of the present invention, an auxiliary board is fixed near the tip of the flexible printed wiring, and a connecting rod that crosses the punched hole along the upright frame is integrated with the slide base. And the distance between the connecting rod and the upright frame is set to be slightly larger than the total thickness of the auxiliary substrate and the support substrate, and the tip of the flexible printed wiring is folded in two. Thus, the light-receiving element for detecting light quantity is fitted into the recess by inserting the supporting substrate and the auxiliary substrate, which are brought into contact with each other, between the connecting rod and the upright frame.

The invention described in claim 1 corresponds to one embodiment (see FIGS. 1 to 7). According to this, the flexible printed wiring is bent and the light receiving element for detecting the light amount is fitted in the recess. The light receiving element for detecting the light quantity passes through a notch groove that opens the ceiling surface of the recess, and there is nothing to contact the light receiving surface of the light receiving element for detecting the light quantity. It is not damaged by a contact accident as in the past, or dust is attached to the light receiving surface and the amount of received light does not decrease. Accordingly, it is possible to accurately detect the amount of light projected from the laser light source with the light receiving element for detecting the amount of light, and to maintain the performance appropriately over a long period of time so that the laser light source is not overheated.

In addition, the light receiving element for detecting the light amount is positioned by being applied to a reference frame that closes the bottom surface of the recess, and the supporting substrate and the auxiliary substrate that are brought into contact with each other by folding the tip portion of the flexible printed wiring are connected. The light receiving element for detecting the amount of light is regulated from two directions by the reference frame and the connecting rod so that the light receiving element for detecting the amount of light does not move in the vertical and horizontal directions. Accordingly, a jig for preventing the light quantity detecting light receiving element from moving unexpectedly is unnecessary, and an adhesive application portion for fixing the light quantity detecting light receiving element is provided between the support substrate and the standing frame. Is sufficient, and the number of times the adhesive is applied is halved compared to the conventional method.
Assembling work is not time-consuming, and the amount of adhesive used is greatly reduced, resulting in lower material costs.

The invention according to claim 2 corresponds to the basic form. According to this, when the flexible printed wiring is bent and the light amount detecting light receiving element is fitted in the recess, the light amount detecting light receiving element is provided. Passes through a notch groove that opens the ceiling surface of the recess, and there is nothing to contact the light receiving surface of the light receiving element for detecting the amount of light, so the light receiving surface may be damaged by a contact accident as in the past The amount of light received does not decrease due to dust adhering to the light receiving surface. Accordingly, it is possible to accurately detect the amount of light projected from the laser light source with the light receiving element for detecting the amount of light, and to maintain the performance appropriately over a long period of time so that the laser light source is not overheated.

According to the third aspect of the present invention, the light receiving element for detecting the light amount is positioned by being applied to the reference frame that closes the bottom surface of the concave portion, and is brought into contact with each other by folding the front end portion of the flexible printed wiring in two. The support substrate and the auxiliary substrate are inserted between the connecting rod and the upright frame, and the light receiving element for detecting the amount of light is regulated in two directions with the reference frame and the connecting rod so as not to move in the vertical and horizontal directions. Has been. Accordingly, a jig for preventing the light quantity detection light receiving element from moving unexpectedly is unnecessary, and an application point of an adhesive for fixing the light quantity detection light receiving element is not between the support substrate and the standing frame. Since only one point is sufficient, the number of times the adhesive is applied is halved compared to the conventional method, so assembly work is not time-consuming, and the amount of adhesive used is greatly reduced, resulting in lower material costs. I will.

1 to 7 show an optical pickup according to an embodiment of the present invention. As shown in FIG. 1, the standing frame 4 is cut out from the top surface 4b of the standing frame 4 to the recess 11, Horizontal beam 14c (
By partially deleting (see FIG. 10), a notch groove 19 is formed to open the ceiling surface 11 b of the recess 11, and the bottom surface 11 a of the recess 11 is formed on the other surface (surface) 3 b of the slide base 3.
A substantially U-shaped reference frame 20 that closes the frame is integrally protruded, and as shown in FIG.
Is a total thickness (t1) of the thickness t1 of the auxiliary substrate 10 and the thickness t2 of the support substrate 9.
+ T2) is set slightly larger than the width (for example, about 1 to 2 mm) (α> t1 + t2)
As shown in FIG. 2, in order to insert the end 10a of the auxiliary substrate 10 into the hole 5, the end 1
0a protrudes from the flexible printed wiring 8 by a predetermined length h. Since the configurations and operations other than the above are substantially the same as the configurations shown in FIGS. 8 to 15, the same parts are denoted by the same reference numerals and the description thereof is omitted.

The assembly procedure will be described. As shown by a two-dot chain line in FIG. 3, the support substrate 9 is brought into contact with the auxiliary substrate 10 by folding the tip portion of the flexible printed wiring 8 in two, and shown by a one-dot chain line in FIG. As described above, the flexible printed wiring 8 is bent and the support substrate 9 and the auxiliary substrate 10 are inserted between the connecting rod 15 and the upright frame 4, so that the light receiving element PD <b> 2 for detecting the amount of light is notched into the groove 1.
9 and is fitted into the recess 11, and as shown in FIGS. 4 to 7, the light quantity detecting light-receiving element PD <b> 2 is applied to the reference frame 20 and positioned. Thereafter, as shown in FIGS. 5 to 7, the ultraviolet curable adhesive UV is applied to only one place between the support substrate 9 and the upright frame 4, and the adhesive UV is cured by irradiating ultraviolet rays. The support substrate 9 is bonded to the upright frame 4.

According to the above configuration, the flexible printed wiring 8 is bent to detect the light amount of the light receiving element PD2.
Is inserted into the recess 11, the light quantity detection light-receiving element PD2 passes through the notch groove 19 that opens the ceiling surface 11 b of the recess 11, and the light quantity detection light-receiving element PD 2 has a light-receiving surface. Since there is nothing to contact, the light receiving surface will not be damaged by a contact accident as in the past, or dust will adhere to the light receiving surface and the amount of received light will not decrease. Accordingly, the amount of light projected from the laser light source LD can be accurately detected by the light amount detection light-receiving element PD2, and the performance of the laser light source LD can be properly maintained over a long period of time without being overheated.

In addition, the light receiving element PD2 for detecting the amount of light is positioned by being applied to the reference frame 20 that closes the bottom surface 11a of the concave portion 11, and the support substrate 9 that is brought into contact with each other by folding the tip portion of the flexible printed wiring 8 in two The auxiliary substrate 10 is inserted between the connecting rod 15 and the upright frame 4, and the reference frame is provided so that the light receiving element PD2 for detecting the light amount does not move in the vertical and horizontal directions c to f (see FIG. 6). 20 and the connecting rod 15 are regulated from two directions. Accordingly, a jig for preventing the light quantity detection light receiving element PD2 from moving unexpectedly is unnecessary, and the application position of the adhesive UV for fixing the light quantity detection light receiving element PD2 is the same as that of the support substrate 9. Only one point between the upright frame 4 is sufficient, and the number of times the adhesive UV is applied is halved compared to the conventional case, so that the assembly work is not time-consuming and the amount of the adhesive UV used is greatly increased. Less material costs.

It is a perspective view before the assembly of the optical pickup which is one Embodiment of this invention. It is an AA arrow line view of FIG. It is a top view of the principal part. It is a perspective view after the assembly. It is a top view of the principal part after the assembly. It is a BB arrow line view of FIG. It is CC arrow line view of FIG. It is the schematic which shows a prior art example. It is a perspective view before the assembly. FIG. 10 is a DD arrow view of FIG. 9. It is a top view of the principal part. It is a perspective view after the assembly. It is a top view of the principal part after the assembly. It is an EE arrow line view of FIG. It is a FF arrow line view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Slide base 3a One side of slide base 3b The other side of slide base 4 Standing frame 5 Outgoing hole 7 Control board 8 Flexible printed wiring 9 Support board 10 Auxiliary board 11 Recess 11a Bottom of recess 11b Recessed ceiling 15 Connection light 17 Light Passing hole 19 Notch groove 20 Reference frame D Disk PD1 Reading light receiving element PD2 Light receiving light receiving element LD Laser light source UV Adhesive α Distance between connecting rod and upright frame t1 Auxiliary substrate thickness t2 Support substrate thickness The

Claims (3)

A standing frame is integrally formed on one side of the front and back surfaces of one end side of the slide base that can reciprocate along the radial direction of the disk, and a punched hole is formed on the other side of the slide base. A reading light receiving element and a laser light source are arranged adjacent to each other, and a laser beam is projected from the laser light source onto the disk, and the reflected light is received by the reading light receiving element. A light receiving element for detecting the amount of light is attached to the tip of a flexible printed wiring extending from a control board fixed to the slide base, and a support board, and a hole in the standing frame. A concave portion is formed on the opposing surface, and the bottom surface of the concave portion is open to the other surface side of the slide base, and the flexible printed wiring is bent to remove the support substrate. By inserting the light receiving element for light quantity detection into the recessed part from the open bottom surface of the concave part and placing the light receiving element for light quantity detection against the ceiling surface of the concave part and positioning the adhesive, the support substrate is attached to the standing frame. In the optical pickup in which the amount of light projected by the laser light source is detected by the light receiving element for detecting the amount of light through the light passage hole penetrating the back wall of the recess, from the top surface of the standing frame to the recess A notch groove is formed in the standing frame so as to open the ceiling surface of the recess, and a reference frame for closing the bottom surface of the recess is integrally provided on the other surface of the slide base, and an auxiliary is provided near the tip of the flexible printed wiring. A substrate is fixed, and a connecting rod that crosses the punched hole along the upright frame is integrally formed on the slide base,
The distance between the connecting rod and the upright frame is set to be slightly larger than the total thickness of the auxiliary substrate and the support substrate, and by folding the tip of the flexible printed wiring in two By inserting the supporting substrate and the auxiliary substrate that are in contact with each other between the connecting rod and the upright frame, the light receiving element for detecting the light amount is fitted into the recessed portion from the notch groove of the recessed portion, and the light amount is detected in the reference frame. An optical pickup characterized in that a light receiving element is applied and positioned. A standing frame is integrally formed on one side of the front and back surfaces of one end side of the slide base that can reciprocate along the radial direction of the disk, and a punched hole is formed on the other side of the slide base. A reading light receiving element and a laser light source are arranged adjacent to each other, and a laser beam is projected from the laser light source onto the disk, and the reflected light is received by the reading light receiving element. A light receiving element for detecting the amount of light is attached to the tip of a flexible printed wiring extending from a control board fixed to the slide base, and a support board, and a hole in the standing frame. A recess is formed on the opposite surface,
By deflecting the flexible printed wiring and inserting the support substrate into the hole, the light receiving element for detecting the light amount is fitted in the recess and positioned, and then the support substrate is adhered to the standing frame with an adhesive, thereby In the optical pickup in which the amount of light projected by the laser light source is detected by the light receiving element for detecting the amount of light through the light passage hole penetrating the back wall of the recess, the standing frame is cut out from the top surface of the standing frame to the recess. A notch groove is formed to open the ceiling surface of the recess,
A reference frame for closing the bottom surface of the recess is integrally formed on the other surface of the slide base, and the light amount detecting light receiving element fitted in the recess from the notch in the recess is applied to the reference frame for positioning. An optical pickup characterized by An auxiliary board is fixed in the vicinity of the tip of the flexible printed wiring, and a connecting rod that crosses the punched hole along the upright frame is integrally formed on the slide base, and an interval between the connecting rod and the upright frame is set at the auxiliary frame. The thickness of the substrate and the thickness of the support substrate is set to be slightly larger, and the support substrate and the auxiliary substrate, which are brought into contact with each other by folding the front end portion of the flexible printed wiring, are connected to the connecting plate. The optical pickup according to claim 2, wherein the light receiving element for detecting the amount of light is fitted into the recess by being inserted between the frame and the upright frame.

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