JPS6138109Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention allows magnetic recording and reproducing devices such as video tape recorders and audio tape recorders (including those without a recording function) to perform functions such as stop, playback, recording, fast forwarding, rewinding, etc. The present invention relates to a device that detects which state the device is in.

An example of a conventional state detection device of this type will be described with reference to FIGS. 1 to 5.

FIGS. 1A and 1B are a top view and a side sectional view of the main parts when the magnetic recording/reproducing apparatus is in a stopped state. In the figure, a movable member 10 is capable of linearly reciprocating in the direction of arrow a to a plurality of positions corresponding to various aspects of the magnetic recording/reproducing device in conjunction with an operating device (not shown) such as a push button. . The fixed member 12 has fixed terminals 14, 16, 1 corresponding to the plurality of positions.
8 is provided, and a common ground terminal 20 is also provided. The movable member 22 is slidable in the direction of arrow b with respect to the fixed member 12, has a movable terminal 24 that presses against the fixed member 12 by its own elastic force, and is implanted in the movable member 10. It has an engagement hole 28 that engages with the provided engagement pin 26, and moves integrally with the moving member 10. While holding the movable member 10 in the stop mode position, the movable terminal 2
The fixing member 12 is installed at a position where the fixing member 4 contacts the fixed terminal 16. In this case, since the movable terminal 24 is also in contact with the ground terminal 20, the fixed terminal 16 and the ground terminal 20
is in an electrically conductive state.

Further, FIG. 2 shows a state in which the movable member 10 is moved to a fast-forward mode position while the fixed member 12 remains in the position shown in FIG. 1. In this case, the moving member 1
The amount of movement x ₁ of 0 and the center-to-center distance y ₁ between the fixed terminals 14 and 16 are in the relationship x ₁ =y ₁ .
Therefore, since the movable terminal 24 is in contact with the fixed terminal 14 and also in contact with the ground terminal 20, the ground terminal 20 and the fixed terminal 14 are in contact with each other.
becomes electrically conductive. Further, FIG. 3 shows a state in which the movable member 10 is moved to a reproducing position while the fixed member 12 remains in the position shown in FIG. 1. In this case, the amount of movement x ₂ of the movable member 10 and the distance y ₂ between the terminal centers of the fixed terminals 16 and 18 are x ₂
The relationship is ＝y ₂ . Therefore, since the movable terminal 24 is in contact with the fixed terminal 18 and also in contact with the ground terminal 20, the ground terminal 20 and the fixed terminal 18 are electrically connected. Therefore, which fixed terminal and the above earth terminal 2
By detecting whether or not 0 is in a conductive state, the position of the moving member 10 can be detected, and the state of the magnetic recording/reproducing device can be detected.

In practice, the number of aspects of the magnetic recording/reproducing device is greater than that shown in FIG. 1, and the number of fixed terminals is also greater. However, as recent trends in magnetic recording and reproducing devices have focused on miniaturization and weight reduction, it is necessary to reduce the size of the fixed member itself and the amount of movement of the movable member. ₁ and y ₂ must be made smaller.

However, if the fixed terminals are brought too close to each other by reducing the center-to-center distance y ₁ and y ₂ of the fixed terminals, there is a problem in that the insulation resistance between the fixed terminals decreases in terms of the electrical circuit. The distances Z ₁ and Z ₂ between the fixed terminals shown in can not be made very narrow.
Therefore, in order to narrow the fixed terminal center distances y ₁ and y ₂ and not to narrow the fixed terminal distances Z ₁ and Z ₂ , the fixed terminal width B must be narrowed.

On the other hand, unless there is a fairly large clearance between the outer diameter d of the engagement pin 26 and the inner diameter D of the engagement hole 28, assembly will be extremely difficult and work efficiency will be significantly reduced. δ=D−d is provided. However, when the movable member 10 is in the stop mode position and the left side portion 30 of the engagement pin 26 and the left inner side portion 32 of the engagement hole 28 are in contact with each other as shown in FIG. When set, the fixed terminal 16 and the ground terminal 20 are electrically connected, so no abnormality is recognized in the magnetic recording/reproducing device. However, when the moving member 10 moves in the direction of the arrow k shown in FIG. 2 when the fast-forward mode is once changed to the stop mode again, the moving member 10 moves in the direction of the arrow k shown in FIG. 34 moves to a stop position while being in contact with the right inner side portion 36 of the engagement hole 28. At this time, as mentioned above, the fixed terminal width B has become narrower, so if the relationship between the clearance δ and the fixed terminal width B is B/2<δ, the movable terminal 24 can be moved as shown in FIG. Do not contact the fixed terminal 16. However, the moving member 10
Fixed terminal 1 is fixed even though it is in the stop position.
6 and the ground terminal 20 are in a non-conducting state, it is not possible to detect that the magnetic recording/reproducing device is in a stopped state, causing repeated malfunctions and causing damage to the magnetic tape or the magnetic recording/reproducing device. It was always the cause.

This invention aims to solve the above-mentioned problems.
The structure is such that the movable member moves together with the moving member without rattling, and it is easy to assemble and has good workability.As magnetic recording and reproducing devices become smaller and lighter, the fixed terminal It is an object of the present invention to provide a state detection device for a magnetic recording/reproducing device that does not malfunction even if the width is reduced.

Hereinafter, the present invention will be explained based on the illustrated embodiments. In FIGS. 6A and 6B, the moving member 38 corresponding to the aforementioned 10 is an operating device such as a push button (not shown).
A clamped portion 40 having a thickness of t is provided on a plane perpendicular to the direction of the arrow a. There is. The fixing member 12 has fixed terminals 14 at the plurality of positions as in the conventional example described above.
16, 18, and a common ground terminal 20
Also provided. The movable member 42 is slidable on the fixed member 12 in the direction of arrow b, and has a movable terminal 24 attached thereto which presses against the upper surface of the fixed member 12 by its own elastic force. The movable member 42 has a pair of arms 44 that can be elastically deformed in the direction of arrow c, as shown in FIG. 7, and the gap h between the pair of arms 44 is such that h<t. Then, the both arms 44 are bent by (t-h), and the held part 40 is held by the elastic force thereof. This portion is referred to as a holding portion 46. Therefore, unlike the conventional example described above, the movable member 42 does not cause rattling in the sliding direction of the movable member 42 with respect to the movable member 38, so that the movable member 42 moves completely integrally with the movable member 38. do. Here, as shown in FIG. 6, the moving member 3
While holding 8 in the stop mode position, move the movable terminal 24.
The fixing member 12 is set at a position where it contacts the fixed terminal 16. At this time, the movable terminal 24 is also in contact with the ground terminal 20, so the fixed terminal 16 and the ground terminal 20 are electrically connected.

Next, when the movable member 38 is moved to the fast-forward mode position while the fixed member 12 remains in the position shown in FIG. 6, the amount of movement x ₁ of the movable member 38 is
The distance between the terminal centers of the fixed terminals 14 and 16 y ₁ is x ₁
= y ₁ , therefore, the above fixed terminal 14
and the ground terminal 20 are electrically connected.

Furthermore, when the movable member 38 is moved to the reproduction mode position, the amount of movement x ₂ of the movable member 38 and the distance y ₂ between the terminal centers of the fixed terminals 16 and 18 are x ₂
= _y2 , so the fixed terminal 18 and the ground terminal 20 are electrically connected. Therefore, by detecting which fixed terminal and the ground terminal 20 are electrically connected, the position of the movable member 38 can be detected, and the state of the magnetic recording/reproducing device can be determined. .

With the above configuration, the movable member 42 moves completely integrally with the movable member 38 in the sliding direction of the movable member without causing rattling, so that the clearance δ in the conventional example described above is the same as δ=0. Since the fixed terminal width B is B>0, it is impossible for the equation (B/2<δ) to hold true. Therefore, even if the fixed terminal width B is narrowed in order to reduce the size and weight of the magnetic recording/reproducing device, when the movable member 38 moves to a certain mode position, the movable terminal 24 is attached to the fixed terminal corresponding to that mode. The fixed terminal and the ground terminal 20 are in a conductive state, and the position of the movable member 38 can be reliably detected. Therefore, malfunctions of the magnetic recording/reproducing apparatus are eliminated, and damage to the magnetic tape and damage to the magnetic recording/reproducing apparatus itself can be avoided. Furthermore, for assembly, it is sufficient to simply insert the held portion 40 into the gap h between the pair of arm portions 44 provided on the movable member 42.
Assembly work efficiency is also significantly improved.

FIGS. 8A and 8B and FIG. 9 show other embodiments of the present invention. In those drawings,
A moving member 48 corresponding to the above-mentioned 38 is linearly reciprocated in the direction of arrow a to a plurality of positions corresponding to various aspects of the magnetic recording/reproducing apparatus. Fixed member 1
2 are fixed terminals 14, 16, 18 at the plurality of positions mentioned above.
It is similar to the previous embodiment that it has a common ground terminal 20. Here, the movable member 50 corresponding to the above-mentioned 42 is the fixed member 1
2 in the direction of arrow b, and is provided with a movable terminal 24 that presses onto the fixed member 12 by its own elastic force.
A clamped portion 52 having a thickness of t' is also provided. Further, the moving member 48 is provided with an arrow f shown in FIG.
A pair of arm portions 54 that can be elastically deformed in the direction are provided, and a gap h' between the pair of arm portions 54 is set to h'<t', and the pair of arm portions 54 is (t'-h ') bend;
A clamping part 56 is formed which clamps the clamped part 52 by its elastic force. Therefore, as in the previous embodiment, the movable member 50 does not rattle with respect to the movable member 48 in the sliding direction of the movable member 50, and therefore moves completely integrally with the movable member 48. Therefore, in this case as well, the same effects as in the previous embodiment can be obtained.

As is clear from the above explanation, according to the present invention, even if the fixed terminal width is narrowed, the position of the movable member can be accurately detected without any problem, and as a result, the A magnetic recording and reproducing device can be easily realized, and malfunctions of the magnetic recording and reproducing device are eliminated, and the magnetic tape and the magnetic recording and reproducing device themselves are not damaged. In addition, for assembly, the movable member or the movable member can be clamped in the gap between a pair of arms, and the fixed member can be moved and adjusted to determine the installation position of the fixed member. This provides excellent effects such as simplifying the adjustment work for relative positioning of the moving member and the detection means, which are made up of a member and a movable member, and significantly improving assembly workability.

[Brief explanation of drawings]

1A and 1B are top views and side sectional views of the main parts of the conventional example, FIGS. 2 and 3 are top views of the main parts of the conventional example in various states, and FIGS. 4 and 5 respectively. A,
B is a top view and a side sectional view of the main part in various states of the conventional example, FIGS. 6A and B are a top view and a side sectional view of the main part of an embodiment of the present invention, and FIG. 7 is the same. A top view of the movable member portion in the embodiment, FIGS. 8A and 8B are a top view and a side sectional view of the main part of another embodiment of the present invention, and FIG. 9 is a side view of the main part of the movable member in the same embodiment. It is a diagram. 12... fixed member, 14, 16, 18... fixed terminal, 20... earth terminal, 24... movable terminal,
38... Moving member, 40... Clamped part, 42...
Movable member, 44... Arm part, 46... Clamping part, 48
...Moving member, 50...Movable member, 52...Holding portion, 54...Arm portion, 56...Holding portion.

Claims (1)

[Scope of utility model registration request] A movable member that moves to a plurality of positions corresponding to various aspects of a magnetic recording and reproducing device, a fixed member that has fixed terminals provided corresponding to the plurality of positions and whose mounting position can be adjusted, and the fixed member. a movable member having a movable terminal that is slidable against the movable member and moves integrally with the movable member in an engaging relationship with the movable member; and as the movable member moves, the movable member also moves. position of the movable member by detecting that the movable terminal and the fixed terminal become electrically conductive when the movable terminal contacts one fixed terminal of the plurality of fixed terminals. , and further comprising a clamped part on one of the movable member and the movable member, and a clamping part that elastically clamps the clamped part on the other. A state detection device for a recording/playback device.