JPH04127501U - Driven object position detection mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To make electronic equipment thinner and smaller even when a large position detector with a large number of detection circuits is arranged. [Structure] A rotating body 33 of a mode switch 30 is provided with a gear portion 35 on its face surface 34. In the direction in which the rotation axis of the rotating body 33 is perpendicular to the axis 7a of the cam gear 7,
and the gear portion 7b are engaged with each other. When the motor M drives the loading ring 2, the reduction mechanism 4, 6 and the cam gear 7
The rotary body 33 is also driven via. The mode switch 30 outputs a signal according to the loading state (mode). Since the rotational axis of the rotating body 33 is disposed in a direction perpendicular to the axis 7a of the cam gear 7, the number of detection circuits can be increased to
Even if you set the diameter of mode switch 3 to be large,
0 takes up no space in the thickness direction (vertical direction). This allows electronic devices and the like to be made smaller and thinner.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is suitable for detecting the loading position of a VCR, for example. The present invention relates to a position detection mechanism for a driven body.

0002

[Conventional technology]

Figures 4 to 7 show an example of a video deck loading position detection mechanism. be. M is a loading motor that rotates in forward and reverse directions, with a shaft (not shown) is fixed to the seat. M1 is the motor shaft, and a pair of pulleys M2 and M3 are fixed. has been done. 3 is a belt, which connects the pulley M2 of the motor M and the loading gear 1. It is hung on the pulley 1a. 2 is a loading ring, and this gear part 2 a and the gear portion 1b of the loading gear 1 are meshed with each other.

0003 4 is a worm, and a pulley 4a is arranged at one end of the worm. This worm 4 is pivotally attached to the chassis so that pulley 4a and pulley M3 directly face each other. 5 is a belt, which is hung around the pulley 4a and pulley M3. 6 is warm The shaft is a wheel, and the shaft is rotated so that the intersection angle between the axis 6a and the axis of the worm 4 is a right angle. The shaft is attached to the seat. The worm wheel 6 and the worm 4 constitute a deceleration mechanism. to be accomplished. 7 is a cam gear, which connects the worm wheel 6 and the position detector 8, which will be described later. placed in between. The gear portion 7b of the cam gear 7 is the same as the gear portion 6 of the worm wheel 6. b and the gear portion 21a of the position detection body 8, respectively.

0004 8 detects the rotational position of the loading ring and transmits the state to the control circuit. This is a position detector (hereinafter referred to as a mode switch) for Mode switch 8 As shown in FIG. 5, it consists of a frame 9, a printed circuit board 10, and a rotating body 20. frame body 9 has a rectangular shape as shown in FIG. It is attached to the corner of the frame 9. Piece 9a is arranged. The mode switch 8 is mounted on the mounting piece 9a of the frame 9. It is fixed to the shi.

[0005] The rotating body 20 includes a gear 21 and a rotating plate 22, as shown in FIG. gear 2 1 has a gear portion 21a carved on its outer peripheral surface. Also, the gear 21 has A shaft hole 21b for inserting a shaft portion 23 of a rotary plate 22, which will be described later, is bored in the center of the rotary plate 22. ing.

[0006] The rotating plate 22 includes shaft parts 23 and 24 and a disc part 25. The shaft portion 23 has a shape shown in FIG. As shown in the figure, locking pieces 23a, 23a are provided in a protruding manner to face each other. This shaft portion 23 is slightly smaller in diameter than the shaft hole 21b of the gear 21, and the shaft portion 23 is inserted into the shaft hole 21b. By engaging them, the gear 21 and the rotating plate 22 are integrated. The shaft portion 24 is shown in FIG. As shown, the diameter is larger than that of the shaft portion 23. This shaft portion 24 is the shaft hole 9 of the frame body 9. Fits into c.

[0007] As shown in FIG. 5, the disk portion 25 has a central axis 26 and a peripheral edge 27 in the same direction and at the same distance. It is disc-shaped and protrudes at a distance. On the back surface 25a of the disc portion 25, there is a A conductive sliding body 28 is fixed at an appropriate location. In other words, the sliding body 28 , as shown in FIG. 5, is arranged in the hollow of the disc portion 25. The sliding body 28 has two points in FIG. As shown by the chain lines, the three sliding pieces 29a to 29c are arranged at a predetermined distance in the radial direction of the disc portion 25. They are arranged in parallel with a distance between them. The free end side of the sliding pieces 29a to 29c (in Fig. 5, the upper end side) is biased in a direction opposite to the back surface 25a of the disc portion 25 (rightward in FIG. 5). is set to .

[0008] The printed circuit board 10 is connected to the hole 10b and the central axis 2 on the back side of the frame 9 (on the right side in FIG. 5). It is disposed in a state where it is fitted with the shaft portion 26a of No. 6. And printed circuit board 10 As shown in FIG. 5, the locking piece 9b of the frame body 9 is inserted into the hole of the printed circuit board 10. Later, it is fixed to the frame 9 by crushing the tip of the locking piece 9b. print base As shown in FIG. 6, a conductive pattern is provided on the pattern surface 10a (left surface in FIG. 5) of the plate 10. The rings 11 to 13 are placed at respective positions where they contact the sliding pieces 29a to 29c, respectively. They are arranged over a certain angular range.

[0009] A predetermined voltage is applied to the terminal 13a of the conductive pattern 13. conductive putter When the sliding piece 29c contacts the ring 13, the sliding piece 29c touches the entire sliding body 28. A voltage is applied. In this state, the sliding piece 29a or 29b is connected to the conductive pattern 1. 2 or 11, there is a terminal 12a depending on the position of the sliding body 28. Alternatively, a predetermined voltage can be obtained at 11a.

0010 Next, the operation of this position detection mechanism will be explained. First, by driving motor M, When the motor shaft M1 rotates clockwise, the belt 3 and the loading gear 1 The loading ring 2 is rotated counterclockwise via . This rotation causes Loading is performed. Worm 4 also rotates clockwise, and The engaged worm wheels 6 rotate in a clockwise direction. from motor M The rotation is decelerated by the worm 4 and the worm wheel 6.

[0011] Next, the rotation of the worm wheel 6 is controlled by the mode switch 8 via the cam gear 7. It is transmitted to the rotating body 20. When the rotating plate 22 of the rotating body 20 rotates, the sliding body 28 rotates. The sliding pieces 29a to 29c are in contact with the pattern surface 10a of the printed circuit board 10. Moving. Therefore, the position of the sliding body 28 changes depending on the loading state, and the motor There is a signal S11 at terminals 11a and 12a of the load switch 8 depending on the loading state. Otherwise, S12 is obtained. This signal S11 or S12 is supplied to a control circuit (not shown). is supplied to detect the loading state. In other words, mode switch 8 By detecting the recording position, you can rewind or fast forward during recording or playback. You can know the mode status of etc.

0012

[Problem that the idea aims to solve]

By the way, in order for the mode switch 8 to detect complicated operations, the number of detection circuits must be increased. (number of bits) needs to be increased. Therefore, the diameter of the rotating body 20 is set large. There is a need. In this case, the mode switch 8 is arranged in a plane with respect to the cam gear 7. Therefore, as the rotating body 20 becomes larger, the thickness direction (in the vertical direction in FIG. 4) ) space is required. Therefore, there are some drawbacks such as not being able to make the VCR thinner. Convenience arises.

[0013] Therefore, this idea enables even when a large position detector with a large number of detection circuits is installed. The purpose is to make electronic devices thinner and smaller.

[0014]

[Means to solve the problem]

In this invention, a position detection body in which a gear part is arranged on the rotor, and a Equipped with a gear that meshes with the gear part of the body, the position of the driven body can be detected by the rotation angle of the rotor. In the rotating mechanism, the gear part of the position detector is placed on the face of the rotor. The shaft of the child is arranged in a direction perpendicular to the shaft of the gear.

[0015]

[Effect]

First, the motor M drives the driven body 2 . Along with this, the position is The rotor 33 of the detection body 30 is driven. The position detector 30 detects the rotation angle of the rotor 33. Therefore, the position of the driven body 2 is detected. The direction in which the axis of rotor 33 is orthogonal to the axis of gear 7 Therefore, it is necessary to increase the number of detection circuits and set the diameter of the rotor 33 large. Even if there is, there is no need to increase the thickness in the thickness direction. In other words, the position detection body 30 is arranged perpendicularly to the gear 7, so there are fewer restrictions on the arrangement of the rotor 33. Therefore, electronic devices, etc. can be made thinner and smaller.

[0016]

【Example】

An embodiment of this invention will be described below with reference to the drawings. Figure 1-Figure 3, parts corresponding to those in FIGS. 4 to 7 are given the same reference numerals, and their detailed explanations are Omitted.

[0017] 30 is a mode switch, which connects the frame 31, the printed circuit board 32, and the rotating body 33. Become. As shown in FIGS. 2 and 3, a gear portion is provided on the face surface 34 of the rotating body 33. 35 is provided protrudingly. As shown in FIG. 2, the gear portion 35 They are arranged along the outer circumferential surface at the periphery. The mode switch 30 is as shown in FIG. , are arranged horizontally at approximately the same height as the belt 5. In other words, the mode switch In the switch 30, a rotating shaft 36 of a rotating body 33, which will be described later, is perpendicular to an axis 7a of the cam gear 7. arranged in the direction.

[0018] The rotating body 33 is arranged rotatably with respect to the frame body 31. In other words, rotating body 3 3, as shown in FIG. 3, from the center of its back surface (lower surface in FIG. 3), are connected. This rotating shaft 36 fits into the hole 32a of the printed circuit board 32, It forms the rotation core of the rotating body 33. Also, the opposite side of the gear portion 35 of the rotating body 33 As shown in FIG. 3, a flange 37 extends outward from the outer peripheral surface of It is installed protrudingly. This flange 37 prevents the rotating body 33 from separating from the frame 31. This is to prevent this and also to make the rotation of the rotating body 33 smooth. Back side of rotating body 33 A sliding body 38 is fixed to 33a. The configuration of the sliding body 38 is shown in FIGS. 5 and 6. This is similar to the sliding body 28 in the example.

[0019] The frame 31 and the printed circuit board 32 are arranged so that the locking piece 39 of the frame 31 is connected to the printed circuit board 32. After being inserted into the hole, the tip of the locking piece 39 is crushed to lock it. This example is , is configured as described above, and the rest is the same as the example shown in FIG.

[0020] According to this example, the rotation from the cam gear 7 is in a direction perpendicular to the axis 7a of the cam gear 7. and is transmitted to the rotating body 33. Other operations are similar to those of the conventional example.

[0021] In this example, the rotation shaft 36 of the mode switch 30 is connected to the shaft 7a of the cam gear 7. The diameter of the rotating body 33 can be reduced by increasing the number of detection circuits. Even when increasing the size, the arrangement of the mode switch 30 is in the depth direction of the video deck (Fig. 2, it extends in the front-to-back direction) and does not affect the thickness direction (in the vertical direction in FIG. 1). In other words, even if the diameter of the rotating body 33 is increased and the number of detection circuits is increased, the Can be done.

[0022] In the above-mentioned embodiment, the loading drive mechanism of the video deck is described. This is an example in which the position detection mechanism is applied, and the position detection mechanism of the driven body is, for example, D. It can also be applied to AT, etc.

[0023]

[Effect of the idea]

According to this idea, the axis of the rotor of the position detection body is arranged in a direction perpendicular to the axis of the gear. Therefore, even when increasing the number of detection circuits and setting the rotor diameter large, the thickness It does not take up space in the direction, and electronic devices can be made smaller and thinner.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example.

FIG. 2 is a plan view of the mode switch of the embodiment.

FIG. 3 is a diagram showing an enlarged cross section taken along line II-II in FIG. 2;

FIG. 4 is a diagram showing a conventional example.

FIG. 5 is a diagram showing an enlarged cross section taken along line II in FIG. 4;

FIG. 6 is a diagram showing a conductive pattern on a printed circuit board.

FIG. 7 is an explanatory diagram of the output of the mode switch.

[Explanation of symbols]

2 Loading ring 7 Cam gear 7b Gear part 30 Mode switch 31 Frame 32 Printed circuit board 33 Rotating body 34 Face surface 35 Gear part 38 Sliding body

Claims (1)

[Scope of utility model registration request] 1. A mechanism for detecting the position of a driven body based on the rotation angle of the rotor, comprising a position detecting body in which a gear portion is disposed on a rotor, and a gear that meshes with the gear portion of the position detecting body, A position detection mechanism for a driven body, characterized in that a gear portion of the position detection body is disposed on a face of the rotor, and the axis of the rotor is disposed in a direction perpendicular to the axis of the gear.