JPS6334107Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video disc player having a micro switch that electrically detects opening and closing of a lid.

In a video disc player that uses a laser beam for playback, the laser beam must continue to emit light as long as the player is turned on due to its nature. Therefore, the lid of the player must be able to be opened reliably when loading a video disc, but when the lid is opened, the shutter in the path of the laser beam must be reliably closed to prevent danger. be.

On the other hand, in a normal playback state, the laser beam shutter must be kept open reliably, and in addition, the lid must be interlocked so that it cannot be opened even if the user accidentally or intentionally tries to open it.

In order to meet these demands, a link mechanism that operates in conjunction with the opening and closing of the player's lid is generally used, but the stroke of the link must be large to some extent in order to ensure the above-mentioned operation.

On the other hand, it is necessary for safety to provide a microswitch in the middle of this link mechanism to electrically detect the opening and closing of the lid so that the video disc can rotate only when the lid is closed. However, the operating stroke of a micro switch is small.

For this reason, if the link mechanism applies an operating stroke that is more than necessary to the micro switch, the switch will be destroyed. The stroke applied to the switch is required to be small. In this regard, no reliable and simple method has been provided so far.

The purpose of the present invention is to solve the above-mentioned drawbacks and provide a video disc player with a simple structure that ensures sufficient link stroke while giving appropriate stroke to the micro switch without damaging the switch. be.

The illustrated embodiment will be described in detail below. Figure 1 is a schematic external view, where 1 is the main body, 2 is the main body, and 2 is the main body.
The lid is hinged to the main body 1 by a hinge 5. Reference numeral 3 denotes a lid detection assembly, which is provided on the inner surface of the opening side of the main body 1 and is adapted to engage with a pin assembly 4 provided on the corresponding side of the lid 2.

A perspective view of the shutter and interlock device is shown in FIG. The pin assembly 4 includes a tip portion 4a, a constricted portion 4b, and a shaft portion 4c, and a collar 6 and a spring 7 are fitted onto the outside of the shaft portion 4c. The lid detection assembly 3 has an inverted L-shaped up and down lever 8.
is vertically movable and supported by a support portion (not shown) on the top and back surface of the base plate 9, and abuts against the tip end 10a of a fan-shaped rod lever 100 that is pivotally supported on a shaft 10c provided on the base plate 9. Another tip 11a is adapted to come into contact with an operating piece 13a of a microswitch 13 fixed to the base plate 9. An interlock plate 14 is attached to the upper surface of the base plate 9 through a long hole 14a provided in the base plate so as to be slidable in the direction connecting the two axes with the shaft 15 provided on the base plate 9 as a guide. There is. The interlock plate 14 is constantly pulled toward the hook 16 by a spring 17 stretched between it and a hook 16 (not shown) fixed to the main body, and is also pulled toward the hook 16 by a plunger 18 fixed to the lower end of the base plate 9. The lever 19 is connected to an upper end 19a of a lever 19 having a support shaft in the engaged base body 9.

The rod lever 100 is wound around a shaft 10c, and its tip 10a is biased in a direction to push up the vertical lever 8 by a spring 20 stretched between the lower end of the lever and a hook portion 9a at the lower end of the base plate 9. The rod 21 also engages with another tip 10b.
A support shaft 2 fixedly attached to the main body (not shown)
2c is connected to the end hole 22a of the connecting lever 22. The connecting lever 22 is connected to the end piece hole 25a of the slide 24 by a rod 23 which engages with the other end hole 22b. The pin assembly 4, the up and down lever 8, the rod lever 100 described above,
The rod 21, the connecting lever 22, and the rod 23 are the main components of the link mechanism. In addition, Rod 23
is urged toward the ring 28 by a spring 30 stretched between a ring 28 fixed to the rod and a hook 29 fixed to the main body (not shown). The slide 24, which is fixed with a screw 26 passing through the end piece 25 and its elongated hole 25c, slides in the direction connecting the two axes using the provided elongated hole 24a as a guide, using a shaft 27 fixed to the main body (not shown) as a guide. Free to move. The slide 24, end piece 25, screw 26, shaft 27, and spring 30 described above are the main components of the slide mechanism.

When the lid is closed, the engaging portion 5a of the hinge 5 descends and pushes down the end portion 32a of the lock lever 32. The locking end 3 of the lock lever 32 is rotatable around a support shaft 31 fixed to the main body (not shown).
2b rises at this time, and the slide 24 becomes slidable. When opening the lid, the engaging portion 5 of the hinge 5
As a rotates upward, the lock lever 3 is moved by its own weight.
The locking end 23b of 2 is lowered, and the bent part 2 of the end piece 25
5b, the slide 24 becomes unable to slide. The bent portion 24b of the slide 24 is rotatably attached to a support shaft 33 and a shaft 34 fixed to a main body (not shown), using a long hole 35a formed in the slide itself as a guide. It is in contact with the upper edge 35b of the beam shutter 35. The beam shutter 35 has an end surface 3 facing the support shaft 33.
5c has a notch 35d through which the beam passes,
Also, a spring 37 tensioned between the hook 36 fixed to the main body (not shown) causes the hook 3 to
It is pushed to the opposite side of 6. Support shaft 3 explained above
3. The beam shutter 35, the hook 36, and the spring 37 constitute the main components of the beam shutter mechanism.

Next, the operation of this embodiment will be explained. When the lid is in the closed (regenerated) state, the locking end 32b of the lock lever 32 that is linked to the hinge 5 rises (state shown), and the slide 24 moves to the shafts 27, 27.
while the pin assembly 4 provided on the lid 2 descends and its tip 4a
presses down the vertical lever 8, and the interlock plate 14 engages with the constricted portion 4b, resulting in an interlock state. The amount by which this vertical lever 8 is pressed down is determined by the amount of downward pressing of the vertical lever 8.
3, the slide 24 is pulled in the moving direction. The beam shutter 35, which was locked at the upper edge 35b by the bent portion 24b of the slide, rotates clockwise in the figure around the support shaft 33 due to the biasing force of the spring 37, and is rotated by the end surface 35c. The laser beam indicated by the thick arrow A, which was blocked and closed, passes through the notch 35d and is irradiated toward a disk (not shown).

To open the lid, press the control button (not shown) and the plunger 18 will move to the retracting side, and the lever 19 will pull the interlock plate 14 to the open side (leftward in the figure) to release the interlock, so the pin assembly The lid 2 is opened by the pressing force of the spring of the product 4. At this time, the vertical lever 8 becomes free upwards, so the slide 24 is moved in the closing direction (upper right in the figure) by the urging force of the spring 20 of the rod lever 100 and the spring 30 of the rod 23.
, the elongated hole 24a moves until one end comes into contact with the shaft 27, and the beam shutter 35 is pulled to the closed position.

On the other hand, the engaging part 5a of the hinge 5 moves upward as the lid 2 rises, and the locking end 32b of the lock lever 32 engaged therewith descends due to its own weight.
Since the bent portion 35b of the slide end piece is engaged and locked, the beam shutter 35 will not be opened even if the user presses down the vertical lever 8 with a stick or the like.

Next, the rod lever 100 will be explained in detail. Figure 3a is a front view of the rod lever, and b
is a top view of the rod lever. Rod lever 1
00 is a first lever 10 pivotally supported on a shaft 10c,
A second lever is mounted on the shaft adjacent to the first lever 10 and is locked by a snap spring 10d.
It consists of a lever 11 and a spring 12 provided on both sides and between corresponding arcuate notches 10e and 11e. Due to the tension of the spring 12, the lower end 11b of the second lever 11 locks the lower end locking piece 10b of the first lever 10.
It is locked to.

When the lid 2 of the player is closed, the tip 4a of the pin assembly 4 descends and pushes down the vertical lever 8. When the lower end 8a of the lever comes into contact with the tip 10a of the first lever 10 and pushes down, the first lever 10 is pivoted. Since it is rotated around 10c, the spring 12
The tip 11 of the second lever 11 is pressed by the
a pushes down the operating piece 13a of the micro switch 13 by an amount corresponding to the stroke of the up/down lever 8.

For the above-mentioned reasons, the amount of depression of the vertical lever 8 must be greater than the stroke limit of the actuating piece 13a of the micro switch 13, so there is a risk that excessive force will be applied to the switch body and cause it to break.

On the other hand, the rod lever 100 has the first lever 1.
Since the operating piece 13a of the micro switch 13 is divided into the second lever 11 and the second lever 11, the operating piece 13a of the micro switch 13
When the protrusion 13b of No. 3 is pressed to its stroke limit, the second lever 11 stops rotating. Further, by pressing down the vertical lever 8, the first lever 10
Even if the tip portion 11a of the second lever 11 tries to push down the actuating piece 13a when the lever rotates, the spring 12 having an appropriately set spring constant is compressed so as not to apply more force than necessary to the actuating piece 13a. absorbs any further stroke, so the second lever 11 does not rotate any further and the actuating piece 13a
No force greater than the tensile force of the spring 12 is applied to the spring 12, and damage to the spring 12 is prevented. As a result, when the lid is closed, the microswitch detects that the lid is closed, allowing the disk to rotate.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the positions of specific members provided in a video disc player to which the present invention is applied, FIG. 2 is a perspective view of one embodiment of the present invention, and FIGS. 3 a and b are the embodiments described above. FIG. 2 is a partially enlarged front view and plan view. 4... Pin assembly parts, 8... Up and down lever, 10
0... Rod lever, 10... First lever, 11
...Second lever, 13...Micro switch, 1
3a... Actuation piece, 21, 23... Rod, 22...
...Connection lever, 24...Slide, 25...End piece, 32...Lock lever, 35...Beam shutter.

Claims (1)

[Scope of utility model registration request] A beam shutter mechanism that closes and opens the optical path of the laser beam via one or more levers that are displaced in conjunction with opening and closing of the lid, a pin protruding from the underside of the lid, and a constriction at the tip of the pin. In a video disc player having an interlock mechanism that prevents the lid from being opened during playback, the interlock plate is slidably provided on the main body so as to be able to freely engage with the above-mentioned part that is pressed by the above-mentioned pin. a vertical lever supported on a board of the interlock mechanism so as to be able to move up and down; a first lever that is pivoted to the board and locked to the vertical lever;
A spring that acts on the first lever and always biases the vertical lever upward; and a spring that is coaxially fixed in contact with the first lever and is locked to a locking piece at the lower end of the first lever. an actuating piece of a microswitch that electrically detects opening and closing of a lid, and includes a second lever that connects the first lever and the second lever and biases the levers in a direction to separate them; A locking mechanism for an opening/closing lid of a video disc player, characterized in that the locking mechanism is fixed to a part of the second lever so as to be able to come into contact with it.