JPH08236792A - Photodiode for optical head - Google Patents

Abstract

PURPOSE: To provide a photodiode for an optical head in which position and angle regulations can be easily executed with a simple structure. CONSTITUTION: A photodiode 10 for an optical head comprises a photoreceiver formed on a substrate, a sealing resin mold 11 formed to cover the photoreceiver, and a holder having a hole 13 for regulating the position of the photodiode is integrally molded by the mold 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photodiode for detecting reflected light from an optical disk with an optical head.

[0002]

2. Description of the Related Art Conventionally, an optical head extracts a data signal recorded on an optical disk driven by rotating the optical disk by irradiating a light beam from a light source and detecting reflected light from the optical disk. Therefore, the information is reproduced. At this time, a focusing error signal and a tracking error signal are also detected on the basis of the reflected light so that information can be reproduced accurately.

Here, the above-mentioned detection of the reflected light from the optical disk is performed by using a photodiode as shown in FIG. 2, for example. That is, in FIG. 2, the photodiode 1 is configured by forming a light receiving portion on a substrate and then forming a resin mold portion so as to cover the light receiving portion, as is well known, and a plurality of photodiodes are provided on both sides thereof. Terminal 1a
And in the optical head (not shown) so as to obtain the focusing error signal and the tracking error signal as described above.
And the angle is adjusted around C about the optical axis.

At the time of these adjustments, the photodiode 1 itself is very small, and it is impossible to provide a hole for position adjustment. Therefore, adjustment work can be performed easily.
The photodiode 1 is fixed to a photodiode holder 2 having a position adjusting hole 2a by adhesion or the like. By adjusting the position and the angle of the photodiode holder 2, the position and the angle of the photodiode 1 are adjusted. Is being carried out.

[0005]

However, in such a structure, since the photodiode 1 is bonded and fixed to the photodiode holder 2, the photodiode holder 2 is required and the bonding step is required. is there. Therefore, there is a problem that the component cost and the assembly cost are relatively high.

In view of the above points, the present invention has as its object the provision of a photodiode for an optical head, which has a simple structure and whose position and angle can be easily adjusted.

[0007]

According to the present invention, the above object comprises a light emitting portion formed on a substrate and a sealing resin mold portion formed so as to cover the light emitting portion. In the photodiode for an optical head, a holder having a hole for adjusting the position of the photodiode is integrally formed by a sealing resin mold portion,
This is achieved by a photodiode for an optical head.

[0008]

According to the above construction, since the position adjusting holder is integrally formed,
It is not necessary to fix the position adjustment holder by adhesion or the like, and it becomes possible to directly chuck the photodiode itself and perform position adjustment and angle adjustment. Therefore,
The number of parts can be reduced, and the parts cost and the assembly cost can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail based on an embodiment shown in the drawings. FIG. 1 shows an embodiment of a photodiode for an optical head according to the present invention. That is, in FIG. 1, the photodiode 10 for the optical head is
As is well known, is formed by forming a light receiving portion on a substrate and then forming a resin mold portion 11 so as to cover the light receiving portion, and is provided with a plurality of terminals 12.

The above structure is the same as that of the conventional ordinary photodiode 1, but in the photodiode 10 for an optical head according to the present invention, the resin mold portion 11 is incorporated into the optical head. It is formed so that it can be used as a holder having a position adjusting hole 13 so that position adjustment in the up-down direction A, left-right direction B, and angle adjustment around the optical axis C can be performed.

The optical head photodiode 10 according to the embodiment of the present invention is constructed as described above, and when it is incorporated in the optical head, first the resin mold portion 11 is directly chucked to adjust the position. The position adjustment of the photodiode 10 is completed by adjusting the position of the photodiode 10 in the vertical direction A and the horizontal direction B by the hole 13 and adjusting the angle about the optical axis C.

In this case, since the position adjustment and the angle adjustment can be performed by the position adjusting hole 13 provided in the resin mold portion 11 of the photodiode 10, it is necessary to use a holder or the like separate from the photodiode 10. Absent. Therefore, the component cost and the assembly cost can be reduced.

[0013]

As described above, according to the present invention, since the position adjusting holder is integrally formed, it is necessary to fix the position adjusting holder to the photodiode by adhesion or the like. Instead, it becomes possible to directly chuck the photodiode itself and perform position adjustment and angle adjustment. Therefore, the number of parts can be reduced, and the parts cost and the assembly cost can be reduced.

Thus, according to the present invention, it is possible to provide a photodiode for an optical head in which the position and the angle can be easily adjusted with a simple structure.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a photodiode for an optical head according to the present invention.

FIG. 2 is a schematic perspective view showing an example of a conventional optical head photodiode.

[Explanation of symbols]

 10 Photodiode for optical head 11 Resin mold part 12 Terminal 13 Position adjustment hole

Claims (1)

[Claims] 1. A photodiode for an optical head, comprising a light-receiving portion formed on a substrate and a sealing resin mold formed so as to cover the light-receiving portion, wherein a hole for adjusting the position of the photodiode is provided. A photodiode for an optical head, characterized in that the holder having the above is integrally molded by a sealing resin mold.