JPH054098Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is an optical recording/reproducing device used in an optical recording/reproducing device that records or reproduces information signals on an optical disk by inserting and mounting a cartridge rotatably storing an optical disk. This invention relates to an optical power detection jig for a head.

2. Description of the Related Art Optical recording and reproducing devices using optical disks are expected to provide a new storage device for the information society. In fields where data information is handled, cartridges that rotatably store optical discs are used, taking into account that the recording and playback quality will deteriorate due to direct contact with optical discs, as well as handling and storage issues. A system in which it is inserted into an optical recording/reproducing device is becoming mainstream.

The quality of recording and reproducing information signals on an optical disk depends on the optical power of the light emitted from the optical head, which focuses and irradiates the optical disk into a minute light beam.

In general, if the reproducing light power is too weak, the output of the information signal read by the optical head will be small, causing a deterioration of the S/N ratio, and if it is too strong, the recording material of the optical disc will optically change during long-time reproduction. There is a risk that it will go. In addition, if the optical power of the recording light that is optically modulated in accordance with the information signal is weak, recording will not be sufficient, and if it is too strong, it may damage the recording material in the case of phase shift type recording materials, resulting in poor recording and reproducing quality. lead to deterioration.

Therefore, the light emitted from the optical head and irradiated onto the optical disk must be set to have an optical power within a certain range allowed by the optical disk. However, the optical head used in such a device uses a semiconductor laser as a light source for miniaturization. The current-optical power characteristics of semiconductor lasers or the divergence angle of the light beam emitted from the semiconductor lasers vary considerably from product to product. Furthermore, other optical components such as the aperture lens constituting the optical head also have manufacturing errors in light transmittance and light reflectance.

Therefore, it is necessary to adjust the optical power for each optical recording/reproducing device so that the optical power of the reproducing light becomes suitable for the optical disk and the optical power of the recording light.

Conventional optical power adjustment will be explained based on FIG. 7. Reference numeral 1 designates an optical head, in which light emitted from a semiconductor laser 2 passes through an optical element (not shown), is condensed into a minute light beam by an aperture lens 3, and is emitted. 4 is a semiconductor laser drive circuit that controls the current flowing through the semiconductor laser 2; The photoelectric conversion element 5 is
It receives the light beam emitted from the optical head 1 and is installed above the aperture lens 3. Reference numeral 6 denotes an optical power measuring device main body, which is electrically connected to the photoelectric conversion element 5, and is configured to digitally display the optical power value of the light received by the photoelectric conversion element 6 on, for example, a display section 7.

When the semiconductor laser drive circuit 4 is operated in such a state, the optical power to be irradiated onto the optical disk is emitted from the aperture lens 3 of the optical head 1, and this light beam is received by the photoelectric conversion element 5. The measured value of the optical power is displayed on the main body 6 of the optical power measuring device.

If the measured optical power value is too small or too large for the optical power to be set, adjust the variable polyurethane provided in the semiconductor laser drive circuit 4 to change the current flowing through the semiconductor laser 2 to obtain the desired light. I was trying to be powerful.

Problems that the invention aims to solve However, conventionally, in optical power adjustment,
The photoelectric conversion element 5 is installed at a stage before the components of the optical recording/reproducing device are incorporated into the upper part of the optical head 1.
As soon as the optical head 1 is installed, there are limitations in the manufacturing process or in the components, such as making a hole or the like in the component parts of the optical head 1 so that the photoelectric conversion element 5 can be installed therein. Additionally, if the semiconductor laser drive circuit 4 is operating before and after the photoelectric conversion element 5 is installed, there are safety issues such as the possibility that the laser beam may directly enter the eyes of the worker. To prevent this, special measures must be taken. Safety measures were necessary.

In view of the above-mentioned points, it is an object of the present invention to provide an optical power measuring jig that safely and easily measures the optical power of light emitted from an optical head by inserting it into an optical recording/reproducing device. .

Means for Solving the Problems The present invention consists of a substantially rectangular parallelepiped member of approximately the same size as an optical disk cartridge that rotatably stores an optical disk, and a photoelectric conversion element that directly receives the light beam emitted from the optical head. This is an optical power measurement jig for an optical head that can be inserted into an optical recording/reproducing device.

Function The present invention has the above-described configuration, and by inserting and mounting an optical power measuring jig in the same way as a cartridge containing an optical disk in an optical recording/reproducing device,
Since the optical power of the optical beam emitted from the optical head can be measured by the photoelectric conversion element, the optical power of the optical recording/reproducing device can be easily and safely adjusted.

Embodiment FIG. 1a shows a perspective view of an optical power detection jig for an optical head in a first embodiment of the present invention.
Figure b shows a sectional view of the main part. Reference numeral 10 is a substantially rectangular parallelepiped member having substantially the same size as the casing of an optical disk cartridge, which will be described later. The rectangular parallelepiped member 10 has a positioning hole 1 for positioning the rectangular parallelepiped member 10 when it is inserted into an optical recording/reproducing device to be described later.
1, 11', a drive body insertion hole 12 into which a rotary drive body for rotating the optical disk is inserted, a head window 13 into which an optical head is inserted, a side notch 14, 1
4' etc. are provided.

The detection hole 15 is a hole provided to make it possible to detect that the optical disk cartridge is different from the above-mentioned optical disk cartridge. A photoelectric conversion element 16 receives the light beam emitted from the optical head. The photoelectric conversion element 16 may be constituted by a solar cell or may use a photodiode. 17
is a holding plate that fixes and holds the photoelectric conversion element 16. If the photoelectric conversion element 16 is a solar cell, it is better to fix it by adhesive, and if it is a photodiode, it is better to make the holding plate 17 from a printed board and fix it by soldering. The photoelectric conversion element 16 may be directly fixed to the rectangular parallelepiped member 10 without using the plate 17. The holding plate 17 is fixed to the rectangular parallelepiped member 10.

The fixing position of the photoelectric conversion element 16 takes into consideration the following. When the optical head of the optical recording/reproducing device is moved to the innermost circumferential side of the optical disk, the aperture lens of the optical head and the photoelectric conversion element 16 are arranged to face each other.

Further, the light receiving surface of the photoelectric conversion element 16 is located at a place farther from the optical head than the aperture point of the light beam emitted from the aperture lens of the optical head, and the light beam is reflected by the photoelectric conversion element 16. This is to prevent the received light from entering the photoelectric conversion element 16 again, and to prevent damage to a part of the photoelectric conversion element 16 due to too strong optical power per unit area if the light is received at the aperture point. It is.

A line 18 electrically connects the photoelectric conversion element 16 and a connector 19, and the connector 19 can be connected to the main body of the optical power measuring device described above. 20
is a wire guide groove for guiding the wire 18 provided in the rectangular parallelepiped member 10.

Next, an optical recording/reproducing apparatus and an optical disk cartridge using the optical power detection jig of the present invention will be explained. FIGS. 2a and 2b show perspective views of an example of an optical disk cartridge.

The optical disk cartridge 51 has an upper half 52
-a and a lower half 52-b, an approximately rectangular parallelepiped housing 52, an optical disk 53 rotatably housed in a space formed inside the housing 52, a shutter 54, and a shutter 54 that engages with the shutter 54. a slider 55 for moving the shutter 54 in the direction of arrow A;
It is composed of a tension spring (not shown) that elastically always biases the slider 55 in the direction of arrow A'. The upper half 52-a and the lower half 52-b are provided with a head window 56 into which an optical head is inserted, and a drive body insertion hole 57 into which a rotary drive body for rotationally driving the optical disk 53 is inserted. Reference numerals 58 and 58' designate positioning holes for positioning the optical disk cartridge 51 at a proper position when it is inserted into an optical recording/reproducing apparatus. 59 is a detection hole for detecting that it is an optical disk cartridge.

By moving the protrusion 55-a provided on the slider 55 in the direction of arrow B, the shutter 54 is slid in the direction of arrow A, and the head window 5 is moved as shown in FIG.
6. The driver insertion hole 57 is opened. When the optical disk cartridge is not in use, the shutter is kept closed as shown in FIG. At this time, by opening the shutter, it becomes possible to record and reproduce information signals on the optical disk 53. FIG. 3 shows a sectional side view of the main parts of an example of an optical recording/reproducing device.

60 is a front panel, and an opening 61 is an opening into which the optical disk cartridge 51 is inserted. A cartridge holder 62 is the main component for correctly inserting and mounting the optical disk cartridge 51 into the optical recording/reproducing apparatus, and includes a panel 64 having an insertion opening 63, a rotatable door 65,
engages with the protrusion 55-a of the slider 55 described above,
An engaging piece 66 for opening the shutter 54, a clamp guide pin 67, and an arm protrusion 68 are provided. A clamp arm 69 is rotatable around a shaft 70 and always rotated clockwise by a coil spring 71. Clamp arm 6
9 is provided with a clamp 72 that engages with the tip and is guided by a clamp guide pin 67.

Reference numeral 73 denotes a driving body for rotationally driving the optical disk 53, which includes a motor 74, a rotating shaft 75, and a rotating shaft 7.
5, a centering body 77 that is movable up and down to center the optical disk 53, a compression spring 78 that biases the centering body 77 upward, and a stopper 7.
It consists of 9. 80 is a positioning pin, which is connected to the positioning holes 58, 5 of the optical disk cartridge 1.
8' or the rectangular parallelepiped member 10 of the optical power detection jig
It is inserted into and engaged with the positioning holes 11 and 11' provided in the.

The cartridge holder 62 is designed to move down toward the drive body 73 when the optical disk cartridge 51 is inserted by a predetermined amount, although the specific structure will be omitted.

Reference numeral 1 denotes an optical head, in which light emitted from a semiconductor laser 2 passes through optical parts (not shown), and then is condensed into a minute light spot with a diameter of about 1 μm by a diaphragm lens 3. Information signals are recorded by irradiating the light onto an optical disk. The optical heads are numbered the same as those shown in FIG. 7.

Further, the optical head 1 is transported in the directions of arrows c and c' by a transport mechanism (not shown), so that recording and reproduction can be performed at a desired diameter of the optical disk.

Dirt and dust may enter the cover 81 from the outside,
This prevents it from adhering to the aperture lens 3 of the optical head 1 and reducing the optical power irradiated to the optical disk. Reference numeral 82 indicates a circuit section provided in the optical recording/reproducing device. Here, the semiconductor laser 2 of the optical head 1 is shown.
It has a semiconductor laser drive circuit 83 for driving. It also has circuits necessary for the device, such as a control circuit for focus control and tracking control, a signal processing circuit, and a microcomputer.

84 and 85 are detection switches, and when the optical disk cartridge is inserted and mounted, the detection switch 84
Only the detection switch 85 operates, and only the detection switch 85 operates when the optical power detection jig is inserted and mounted.
This is done by differentiating the positions of the detection holes 15 and 59.

When the detection switch 85 is activated, the above-mentioned transfer mechanism is activated in the circuit section 82 to move the optical head 1 toward the inner circumferential side of the optical disk, that is, toward the driver 73, to a position regulated by a stopper (not shown). , the semiconductor laser drive circuit 83 is operated to cause current to flow through the semiconductor laser 2.

The operation of the optical power detection jig of this embodiment configured as above will be explained.

When the optical power detection jig is inserted through the opening 61 of the front panel 60 of the optical recording/reproducing device,
First, the door 65 is rotated counterclockwise by the insertion force of the rectangular parallelepiped member 10, then guided by the cartridge holder 62, and when the cartridge holder 62 is inserted by a predetermined amount, the cartridge holder 62 is lowered toward the driver 73. FIG. 4 shows a state in which the optical power detection jig is inserted and mounted. Positioning pins 80 are inserted into the positioning holes 11 and 11' of the rectangular parallelepiped member 10, and the rectangular parallelepiped member 10 is positioned. Since the rectangular parallelepiped member 10 is provided with a drive body insertion hole 12 and a head window 13, there is no possibility of collision with the drive body 73 and the optical head 1, thereby causing trouble in mounting. In addition, the clamp 72 is also inserted into the driver insertion hole 1.
There is no problem since it is inserted into 2. Since the detection switch 84 is inserted into the detection hole 15, it does not operate, and only the detection switch 85 is operated. Therefore, the optical head 1 is transferred to the inner circumferential side at the circuit section 82, and the photoelectric conversion element 16 and the aperture lens 3 are opposed to each other. On the other hand, the semiconductor laser drive circuit 83 also operates,
A current is applied to the semiconductor laser 2. Therefore, the light beam emitted from the aperture lens 3 of the optical head 1 can be received by the photoelectric conversion element 16. By connecting the connector 19 to the main body of the optical power measuring device, the optical power of the optical beam emitted from the optical head 1 can be measured.

As described above, according to this embodiment, a photoelectric conversion element is provided in a rectangular parallelepiped member that is substantially the same as an optical disk cartridge, and an optical power detection jig that can be inserted into an optical recording/reproducing device is constructed. Adjusting the optical power of optical recording and reproducing devices is safe and easy.
Further, it can be done without imposing any restrictions on the manufacturing process or the component configuration of the upper part of the optical head.

FIG. 5 is a perspective view of an optical power detection jig showing a second embodiment of the present invention.

In FIG. 5, the rectangular parallelepiped member 10 is the upper half 1
0-a and a lower half 10-b, the line 18 passes through the internal space of the rectangular parallelepiped member 10 and connects to the rectangular parallelepiped member 1.
Although they are derived outside of 0, they are basically the same functions as those shown in FIG. 1, so they are given the same numbers.

The rectangular parallelepiped member 10 is formed by machining and wiring to cover the detection hole 59 and provide the detection hole 15 at a different position in the upper half 52-a and lower half 52-b of the housing 52 of the optical disk cartridge shown in FIG. The rectangular parallelepiped member 10 of the optical power detection jig is constructed by performing the guiding processing of 18.

Compared to optical disk cartridges, the required quantity of optical power detection jigs is small. In the second embodiment, the optical power detection jig can be made inexpensive by making it possible to use it as a rectangular parallelepiped member of the optical power detection jig by simply processing a part of the casing of the optical disk cartridge.

FIG. 6 is a perspective view showing a third embodiment of the present invention. 10 is a rectangular parallelepiped member, 16 is a photoelectric conversion element, 19 is a connector, and 18 is a line that electrically connects the connector 19 and the photoelectric conversion element 16, which is basically the same configuration as shown in FIG. 1. It is.
The difference from the configuration shown in FIG. 1 is that the photoelectric conversion element 16 is fixed to a sliding plate 86. The sliding plate 86 has elongated holes 87 and 88, and a stepped guide pin 90 allows the sliding plate 86 to move in the same direction as the transport direction of the optical head without floating from the rectangular parallelepiped member 10. Guide pin 9
0 is fixed to the rectangular parallelepiped member 10. The handle portion 89 is used when moving the sliding plate. Although not shown, the line 18 is formed along a line guide groove provided in the sliding plate 86.

Effects of the invention As explained above, according to the invention, it is possible to easily and safely adjust the optical power of the optical head of an optical recording/reproducing device that records and reproduces information signals by inserting and mounting an optical disk cartridge. can.
Further, there are no restrictions on component parts or manufacturing processes as in the past.

Furthermore, it is highly effective as it is suitable for checking and confirming damage to semiconductor lasers in the market, and reduction in the optical power of the emitted light from the optical head due to dirt, dust, etc.

[Brief explanation of the drawing]

1A and 1B are perspective views and sectional views respectively showing a first embodiment of an optical power detection jig for an optical head according to the present invention, and FIGS. 2A and 2B are perspective views illustrating an optical disk cartridge. , FIG. 3 is a sectional side view of the main part showing an example of an optical recording/reproducing device, and FIG. 4 is a sectional side view of the main part of the optical recording/reproducing device in which the optical power detection jig of the present invention is inserted and mounted. FIG. 5 is a perspective view showing a second embodiment of the present invention, FIG. 6 is a perspective view showing a third embodiment of the present invention, and FIG. 7 is an explanatory diagram of optical power adjustment of a conventional optical head. be. 1... Optical head, 2... Semiconductor laser, 4,
83...Semiconductor laser drive circuit, 5, 16...Photoelectric conversion element, 10...Rectangular parallelepiped member, 15...Detection hole, 19...Connector, 86...Sliding plate.

Claims (1)

[Claims for Utility Model Registration] (1) An optical disk cartridge can be inserted into an optical recording/playback device for recording and playing back information signals on an optical disk using an optical head, and can be inserted into the optical recording/playback device. At least the part to be inserted into the optical disc cartridge includes a substantially rectangular parallelepiped member of approximately the same size as the optical disk cartridge, a photoelectric conversion element that directly receives the light beam emitted from the optical head, and an electrical connection with the photoelectric conversion element. An optical power detection jig for an optical head, characterized in that it has a connector. (2) A utility model registered as claimed in claim 1, characterized in that a substantially rectangular parallelepiped member is provided with a sliding plate that is movable in the same direction as the direction in which the optical head is transported, and a photoelectric conversion element is provided on the sliding plate. Optical power detection jig for optical head. (3) Claim 1 of the utility model registration claim, characterized in that the light-receiving surface of the photoelectric conversion element is located at a location farther from the optical head than the aperture point of the light beam emitted from the optical head. Or the second
The optical power detection jig for the optical head described in Section 1. (4) The optical power detection jig for an optical head according to claim 1, which is characterized in that a detection hole is provided in the rectangular parallelepiped member to determine that it is different from an optical disk cartridge.