JPH0538413Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention irradiates a laser beam from a laser light source such as a semiconductor laser onto an optical disk on which information signals such as musical tone signals and video signals are recorded, and then detects the reflected light. More particularly, the present invention relates to a switch device for a laser light source of an optical disc player, which reads and reproduces the above-mentioned information signal.

<Background Art and its Problems> Conventionally, in an optical disc player, an optical disc is mounted on a disc table having a disc mounting surface on which the disc is mounted, and a disc comprising a spindle motor or the like that rotationally drives the disc table. The optical pickup device is rotated by a drive device and has an optical system including a laser light source such as a semiconductor laser, various photodetectors, etc., and runs in the normal direction of recording tracks formed on the optical disk.
A laser beam from the semiconductor laser is irradiated from the lower surface side of the optical disk to track the recording track, and the reflected light is detected by a photodisk through an optical system, thereby producing a predetermined information signal recorded on the recording track. It is learned to read and play.

Further, as such an optical disk player, a disk mounting part is provided on the upper surface of the player main body in which the optical pickup device, the disk drive device, etc. are built-in, and the disk mounting portion faces the disk mounting surface, and the optical disk is placed here. In addition, a rotary opening/closing lid is rotatably attached to the player body and is operated to close and open so as to cover the disc mounting portion, and when the rotating opening/closing lid is closed. It has been proposed that the optical disk is pressed and held against the disk mounting surface by means of the opening/closing lid and a holding device provided on the disk mounting surface. This optical disc player is designed so that the optical disc can be directly attached to the player body, thereby simplifying the structure and making it possible to reduce the size and thickness of the player.

By the way, in the optical disk player having the structure as described above, when the rotary opening/closing lid is opened, the objective lens of the optical pickup device is exposed to the outside.
However, since the laser beam emitted from this optical pick-up device poses a hazard to the human body, it is necessary to reliably prevent the laser beam from being emitted due to malfunction of the optical pick-up device when the rotary opening/closing lid is opened. There is.

Therefore, in such an optical disc player, in order to stop driving the laser light source provided in the optical pickup when the rotary opening/closing lid is opened, a so-called leaf switch as shown in FIG. A laser light source switch device is provided. This laser light source switch device is provided in the player body of the optical disc player, and has a pair of leaf spring-shaped lead pieces 2 and 3 provided in parallel with each other on a holding member 1. , 3 are provided with contacts 4 and 5 facing each other. and one lead piece 2
is provided with a pressing part 6, and this pressing part 6 moves by being pressed by a part of the rotary opening/closing lid 7 when the rotary opening/closing lid 7 is closed, and the respective contacts 4, 5 are moved. The power source 8 and the semiconductor laser 9 etc. are connected through contact, and power is supplied. Also,
When the rotary opening/closing lid 7 is opened, the pressing force of the one reed piece 2 is released, and this one reed piece separates the contact 4 from the contact 5 by its spring force, and the semiconductor laser 9 The power supply to such devices is being stopped. In this manner, the power supply to the laser light source such as the semiconductor laser 9 is stopped when the rotary opening/closing lid 7 is opened, thereby preventing malfunction.

However, in the laser light source switch device as described above, the contacts 4 and 5 are welded and burned due to discharge when they are brought into contact and separated, and even after the rotary opening/closing lid 7 is separated, the contacts 4 and 5 are not connected to the laser light source. There is a risk that the power supply will continue.

Further, there is also a risk that the lead piece 2 may become deformed or damaged due to long-term use, and the operation of this laser light source switch device may become unstable.

Therefore, with such a laser light source switch device, it is difficult to completely prevent the optical pickup device from malfunctioning when the rotary opening/closing lid 7 is opened, and sufficient safety of the optical disc player cannot be achieved. do not have.

<Purpose of the invention> In view of the above-mentioned circumstances, the present invention has been devised to provide a laser light source that has excellent operational reliability and durability, can ensure high safety for optical disc players, and is simple in structure and inexpensive. The purpose of this invention is to provide a switch device for

<Summary of the invention> That is, in order to achieve the above-mentioned object, the switch device for a laser light source of an optical disk player according to the invention includes a pair of lead pieces facing each other and separated from each other by a spacer on the player main body side. A bridge piece is engaged and held on the side of the opening/closing lid attached to the player body, which fits between the respective lead pieces and short-circuits the lead pieces when the opening/closing lid is closed.

<Example> Specific examples of the present invention will be described in detail below with reference to the drawings.

In this embodiment, an optical disc player equipped with a laser power switch device according to the present invention has an optical disc 11 mounted on the upper part of a player body 10 to be played by the optical disc player, as shown in FIG. Therefore, the player main body 10 has a disk mounting portion 12 formed in a substantially tray shape corresponding to the shape of the optical disk 11.
However, it is formed into a rectangular shape with the inner circumferential circle of the disk mounting portion 12 being approximately an inscribed circle.

On the front side of the player body 10, there are a power switch operation button 13, a play/pause button 14, a fast forward operation button 15, and a reverse operation button 1.
6. A display section 18 for displaying operation buttons such as a stop operation button 17, a timer, the address of the music to be performed, etc. is provided. Further, an eject button 19 is provided at one front corner of the player main body 10 that is removed from the disk mounting section 12.

Further, it is rotatably attached to the back side edge of the player main body 10 via a hinge mechanism,
A rotary opening/closing lid 20 is provided for closing and opening the disk mounting section 12. This rotary opening/closing lid 20 has a notch in a portion corresponding to the corner so as to cover the entire upper part of the player main body 10, except for the one corner of the player main body 10 where the eject button 19 is provided. It is formed into a substantially rectangular shape. The rotary opening/closing lid 20 is provided with an engaging pawl 21 bent toward the player body 10 in the notch, for example. , which is provided on the player main body 10 and is adapted to engage with an engaging claw 22 operated by the eject button 19. Therefore, when the rotary opening/closing lid 20 is manually closed and pressed against the player body 10, the engaging claws 21 and 22 engage with each other, and the lid 20 is closed against the player body 10. This locks the disk mounting portion 12 and keeps it in a closed state. In this state, the optical disc player has a simple cubic shape as a whole. Note that when the lid is closed in this manner, the rotary opening/closing lid 20 and the player main body 10 are placed in a state where they have a gap _G1 of, for example, about 0.2 mm.

Further, when the engaging claw 22 of the rotary open/close lid 20 is rotated by operating the eject button 19, the rotary open/close lid 20 is opened by a compression spring (not shown) or the like. The engaging state of each of the engaging claws 21 and 22 is released by being slightly rotated in the opening direction, and in this state, the rotating opening/closing lid 20 is opened and the disc is mounted. Part 1
2 is placed in an open state, and the optical disk 11 is exchanged or the like.

The player main body 10 also includes a disk drive device that rotationally drives the optical disk 11 mounted on the disk mounting section 12, and a laser beam that irradiates the recording track of the optical disk 11 that is rotationally driven. An optical pickup device is provided for reproducing the recorded information signals.

The disk drive device includes a spindle shaft 24 rotatably supported by the chassis 23.
, a spindle motor 25 for rotating the spindle shaft 24, and a disk table 27 attached to the spindle shaft 26 and on which the optical disk 11 is placed.

A disk table 27 attached to the tip of the spindle shaft 24 and driven by a spindle motor 25 is attached to the inner plate 2 of the disk mounting section 12.
A large-diameter hole is formed in the center of the disc 8, and the disc is arranged so as to protrude into the disk mounting portion 12 from the large-diameter hole.

Further, the optical pickup device 2 reproduces information signals recorded on the optical disk 11.
Reference numeral 9 indicates that the optical disk 1 is moved by a pair of feed guide members 30, 30 provided on the chassis 23.
It is attached so that it can run freely in the radial direction of the 1. For example, as shown in FIG. 4, this optical pickup device 29 includes a semiconductor laser 32, a main beam for signal reading by diffracting the laser emitted from the semiconductor laser 32, and a main beam for detecting a tracking error. A diffraction grating 34 that separates into two sub-beams, a beam splitter 35, a collimator lens 36, and a laser beam converted into parallel light by the collimator lens 36 is deflected by 90 degrees to the optical axis of the objective lens 33. The pick-up main body 31 and the objective lens 33 are provided to be movable in two axes, that is, the focus direction and the tracking direction. A two-axis drive device 39 that is electromagnetically driven according to the signal and the tracking error signal.
It consists of Note that the returning laser beam reflected from the optical disk 11 is split by the beam splitter in a direction perpendicular to the paper plane of FIG.
Information signals, focus error signals, and tracking errors that pass through an optical system consisting of an intermediate lens and a cylindrical lens for astigmatic focus detection, are guided to a photodetector, and are recorded on the optical disk 11 by the output of the photodetector. I get a signal.

Although not shown, the intermediate lens, cylindrical lens, and photodetector are attached to the pickup body 31.

Further, in the optical pickup device 29, a pickup main body 31, which is movably supported by the pair of feed guide members 30 and 30, is moved around the inner circumference of the optical disk 11 by a pickup drive motor attached to the chassis 23. The objective lens 33 faces the disc mounting part 12 through a long hole 41 formed in the interior plate 28 of the disc mounting part 12, and is mounted thereon and driven to rotate. It faces the signal recording surface of the optical disk 11 and moves along this elongated hole 41 .

In the optical disc player configured in this way, when the rotary opening/closing lid 20 is opened,
A first laser light source switch device and a second laser light source switch device for stopping power supply to the semiconductor laser 32 are provided. The first laser light source switch device, as shown in FIG.
4, and a bridge piece 45 disposed on the inner wall of the rotary opening/closing lid 20 at a position corresponding to the switch unit 42.

The bridge piece 45 is engaged and held by a holding portion 46 formed on the inner wall of the rotary opening/closing lid 20. That is, the holding portion 46 is formed by forming an inward engaging flange portion 48 at the tip of a cylindrical portion 47 protruding from the inner wall of the rotary opening/closing lid 20. The bridge piece 45 is made of a conductive material and is plated with gold to improve reliability. An outward flange portion 49 that engages with the engagement flange portion 45 is formed.
Further, the upper cylinder portion 47 is formed to have a gap G ₂ at least in the axial direction with respect to the flange portion 49, which is larger than the gap G ₁ , for example, about 0.4 mm. Therefore, the bridge piece 45 is held in engagement with the holding part 46 by the flange part 49 engaging with the engagement flange part 48, and is movable in the axial direction by the gap.

Further, around the bridge piece 45 attached in this way, as shown in FIG.
0 is set up. This protective cover part 50 is
It is formed higher than the bridge piece 45 to protect the bridge piece 45 from being damaged by being pressed from the sides. A part of this protective cover section 50 is attached to the player main body 1.
This is the press operation section 51 of the second laser light source switch device provided at 0.

The bridge piece 45 and the protective cover portion 50 are inserted into the player body 10 through a through hole 52 and a U-shaped slit 53 formed at the other front corner of the player body 10.

The switch unit 42 is disposed at a position facing the through hole 52 inside the player main body 10. The switch unit 42 is an insulating unit made of, for example, synthetic resin.
The bottom wall of the switch unit 42 is provided with:
A spacer 54 is formed in a bulging manner so as to divide the switch unit 42 into two parts. As shown in FIG. 7, the spacer 54 has a notch 5 at its midpoint.
5, and the reed pieces 43,
The reed pieces 43 and 44 are formed so as to face the notch 55 from both sides. The reed pieces 43 and 44 are formed, for example, from a phosphor bronze plate, and are bent into a substantially U-shape.
The spacer 54 is fitted and held on both sides of the spacer 54, and is pressed against both sides of the spacer 54 in a resilient manner, so that the contacts 56, 57
The reed pieces 43 and 44 face each other with a space therebetween.
The width and depth of the notch 55 are smaller than the diameter of the bridge piece 4.
It is considered sufficient to insert 5.

In the first laser light source switch device formed in this manner, when the rotary opening/closing lid 20 is closed, the bridge piece 45 moves into the through hole 52 as shown in FIG. As the lead pieces 43 and 44 are expanded, the notch 55 is opened.
is inserted into the contact point 56 and 57 to short-circuit the contacts 56 and 57.
At this time, the rotating opening/closing lid 20 is pressed against the player main body 10 by the pressing force applied to the rotating opening/closing lid 20 for the rotation operation, and the bridge piece 45 is pressed against the respective lead pieces 4.
3 and 44, the holding portion 46 is brought into pressure contact with the bottom surface of the holding portion 46. When the pressing force for the rotating operation is released, the rotating opening/closing lid 20 is slightly spaced apart from the player body 10 as shown in FIG. 9, leaving a gap _G1. Locked. Therefore, the flange portion 49 of the bridge piece 45 is spaced apart from the bottom surface of the holding portion 46.
_G1 , and the engagement flange portion 48 at the tip of the holding portion 46 has a gap.
They are separated by a gap of G ₂ − G ₁ . In this state, even if the rotary opening/closing lid 20 is subjected to an external force, the bridge piece 45 will not move up or down due to this external force.
5 and each lead piece 43, 44 is disturbed,
No chattering occurs.

Further, in the first laser light source switch device configured as described above, each lead piece 43, 44 is placed in a state separated by a spacer 54,
Since they are short-circuited by the bridge piece 45 inserted here, they are welded together by electric discharge or the like, and the short-circuited state does not continue after the rotary opening/closing lid 20 is opened. Furthermore, if the bridge piece 45 is inserted between the lead pieces 43 and 44 and welded by electric discharge or the like, the rotary opening/closing lid 20 will not open, which is extremely safe.

Further, the player main body 10 is provided with a second laser light source switch device. This second
As shown in FIG. 5, the laser light source switch device is arranged near the switch unit 42 and includes a pair of leaf spring-shaped lead pieces 59 and 60 provided in parallel to each other on a holding member 58. It has the following. And these lead pieces 59, 60
Contact points 61 and 62 facing each other are provided at the tips of the . In this second laser light source switch device, when the rotary opening/closing lid 20 is closed, the pressing operation section 51 of the protective cover section 50 causes the pressing section 63 provided on one lead piece 59 to is pressed so that the contacts 61 and 62 come into contact with each other.

The lead pieces 43, 44, 59, and 60 of each laser light source switch device configured in this manner are connected in series between the semiconductor laser 32 and the power source. Therefore, power is supplied to the semiconductor laser 32 through the contacts 56 and 57 and the contacts 61 and 6.
2 are short-circuited, thereby providing additional safety to the optical disc player.

Note that the present invention is not limited to the embodiments described above, and can be modified in various ways. For example, the bridge piece 45 is formed into a rectangular column shape, and each lead piece 43, 44
The contact area may be increased. Further, the present invention may be provided in an optical disc player having a parallel-moving opening/closing lid instead of the rotating opening/closing lid 20.

<Effects of the invention> As is clear from the description of the embodiments described above, according to the invention, each reed piece attached to the player body is placed in a state of being separated by a spacer, and there is no space between these reed pieces. Because it is short-circuited by the bridge piece attached to the inserted opening/closing lid,
These lead pieces are welded together by electrical discharge etc.
There is no possibility that the short-circuit state will continue after the opening/closing lid is opened, leading to malfunction of the laser light source. Further, in the event that a bridge piece is welded between the reed pieces while the opening/closing lid is closed, the opening/closing lid will not open, making it extremely safe.

Furthermore, since the bridge pieces are engaged and held, chattering due to external disturbances is prevented.

Furthermore, since there is no need to greatly displace each lead piece, this laser light source switch has excellent durability.

Therefore, when the lid is opened, power supply to the laser light source can be reliably stopped, and high stability of the optical disc player can be ensured.

Furthermore, the laser light source switch device of the present invention has a simple structure and can be obtained at low cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing a conventional example of the present invention, Fig. 2 is a schematic perspective view showing an optical pickup player to which the present invention is applied, Fig. 3 is a sectional view thereof, and Fig. 4 is an optical pickup device. 5 is a schematic sectional view showing an embodiment of the present invention, FIG. 6 is a plan view showing the bridge piece and the protective cover portion, FIG. 7 is a plan view showing the switch unit, and FIG. 8 is a plan view showing the switch unit. 9 is a cross-sectional view illustrating the state of each reed piece when the rotary opening/closing lid is closed, and FIG. 9 is a cross-sectional view illustrating the state of each reed piece when the rotary opening/closing lid is locked. It is a diagram. DESCRIPTION OF SYMBOLS 10... Player main body, 20... Rotating opening/closing lid, 43, 44... Reed piece, 45... Bridge piece, 46... Holding part, 52... Spacer.

Claims (1)

[Scope of utility model registration request] A pair of reed pieces are provided on the player body side facing each other and separated from each other by a spacer, and on the opening/closing lid attached to the player body, these reed pieces are inserted between the reed pieces when the opening/closing lid is closed. A switch device for a laser light source of an optical disk player, which engages and holds a short-circuiting bridge piece.