JPH0442741Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sensor cap of a fitting type in which the optical axis of an optical pickup and the optical axis of the sensor section of a laser power meter are aligned.

[Conventional technology]

Many optical pickups used in compact disc (CD) players output laser light, but the sensor section of the laser power meter used to measure the output level of the laser light is generally of the type that is held by hand. It is.

[Problem that the invention attempts to solve]

For this reason, the alignment of the optical axis of the pickup and the optical axis of the sensor unit tends to be inaccurate, and
The disadvantage is that axial deviation causes measurement errors.

The present invention provides a sensor cap that facilitates alignment of the optical axes of the two, thereby reducing errors in measuring the laser light level.

[Means for solving problems]

The present invention includes a first recess that fits into the tip of the sensor section of a laser power meter, a second recess that fits into the head of an optical pickup that outputs laser light, and the first and second recesses. The device is characterized in that it includes a through hole that partially communicates with the pickup and guides the laser beam of the pickup to the light receiving end of the sensor section.

[Effect]

The cap of the present invention fits into the tip of the sensor section of a laser power meter in an adapter style, and has a structure that aligns the light receiving axis with the optical axis of the pick-up, so the level of the laser light output from the pick-up can be adjusted at a fixed position. can be measured, reducing measurement errors. Also, since it is an adapter type, it can be used with other types by attaching different types of caps to the same sensor part.

〔Example〕

FIG. 1 is a configuration diagram of a single cap showing an embodiment of the present invention, in which a is a side sectional view and b is a plan view.

In the figure, reference numeral 10 denotes a disk-shaped sensor cap, inside of which there is a first recess 11 into which the tip of the sensor fits, a second recess 12 into which the head of the pickup fits, and a space between the two. A through hole 13 is formed to communicate the pickup laser beam to the light receiving end of the sensor section.

2 and 3 are a side view and a perspective view during measurement, and 20 is a sensor section of a laser power meter;
30 is an optical pickup, and 40 is its optical axis. The sensor part 20 is inserted with its tip into the recess 11 of the cap 10 with a slight pressure, and then the sensor part 20 is inserted into the recess 11 of the cap 10.
It is integrated with 0. A light receiving element 21 is provided at the tip of the sensor section 20, and when the tip is fitted into the recess 11 to the final position, the element is exposed toward the recess 12 through the through hole 13. Since the through hole 13 is located at the center point of the recess 12, the recess 12 can be picked up 3.
When it is fitted onto the head of 0, it coincides with its optical axis 40.

A lens 31 outputs laser light and receives reflected light from a CD (not shown).

If the cap 10 has the structure described above, the optical axis 40
Since the lens 31, the through hole 13, and the light receiving element 21 are arranged above, and the distance between the light receiving element 21 and the lens 31 is also constant, no measurement error occurs.

[Effect of idea]

As described above, according to the present invention, measurement errors due to positional deviation of the optical axis are eliminated, so that the laser light output of the optical pickup can be measured with high accuracy using the sensor section of the portable laser power meter. In addition, since it is an adapter type, conversion and maintenance are easy, and it has the advantage of being compatible with other types by changing the type.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing one embodiment of the present invention;
The figure and FIG. 3 are a side view and a perspective view at the time of measurement. In the figure, 10 is a sensor cap, 11 is a first recess, 12 is a second recess, 13 is a through hole, 20 is a sensor section, 21 is a light receiving element, 30 is an optical pickup, 31 is a lens, and 40 is a through hole. It is the optical axis.

Claims (1)

[Scope of utility model registration request] A first recess that fits into the tip of the sensor section of the laser power meter, a second recess that fits into the head of an optical pickup that outputs laser light, and the first and second recesses partially communicate with each other. 1. A cap for a sensor of a laser power meter, comprising a through hole for guiding laser light from the pickup to a light receiving end of the sensor section.