JP3074178U - Mode switch on cassette deck - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the size of a mode switch. The mode switch is rotated in accordance with the operation mode of a cassette deck, and includes a stator and a rotor. The stator 3 has a contact forming surface on which a plurality of contacts 11 are formed. The rotor 5 is a disk-shaped member having a slider 6 that can contact each contact 11 on a surface of the stator 3 facing the contact forming surface. The stator 3 and the rotor 5 are positioned in the radial direction by being rotatably fitted on the outer peripheral side of the contact forming surface.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a mode switch, and more particularly, to a mode switch that is turned according to an operation mode of a cassette deck.

[0002]

[Prior art]

 A cassette deck such as a video deck is provided with a mode switch that operates according to each operation mode such as cassette storage or reproduction, rewinding, and the like. This type of conventional mode switch generally includes a cam that rotates in accordance with the operation mode of the deck, a rotor that can rotate following the cam, and a stator on which the rotor is rotatably mounted. Is provided. A plurality of contacts are formed on the upper surface of the stator, and a slider capable of contacting the plurality of contacts is mounted on the lower surface of the rotor.

In this mode switch, when the cassette is stored in the deck or the deck is instructed to play, rewind, etc., and the operation mode is changed, the cam rotates according to the operation mode. At this time, the rotor rotates following the cam and relatively rotates by a predetermined angle with respect to the stator. Then, the contact positions of the plurality of contacts and the slider are shifted in the circumferential direction, whereby the connection between the plurality of terminals is switched, and the resistance of the mode switch is switched. Then, a signal corresponding to the operation mode is transmitted from the mode switch to the control unit, and the control unit controls the display unit, the playback device, and the like based on the signal.

A conventional mode switch of this type generally includes a positioning mechanism for positioning the center of rotation of the rotor with respect to the stator. As such a positioning mechanism, techniques as disclosed in Japanese Utility Model Laid-Open No. 62-73330, Japanese Utility Model Laid-Open No. 62-101130, and Japanese Patent Application Laid-Open No. 5-89565 have already been proposed.

[0005]

In the mechanism disclosed in the above publication, a through hole is formed at the center of the stator and the rotor, and a rotation support portion is provided on the stator side from the edge of the through hole of the rotor. It is formed so as to extend. In this mechanism, the rotation support portion of the rotor is engaged with the through hole of the stator, and the rotation center of the rotor is positioned with respect to the stator by inserting the rotation shaft of the cam into the through hole of the rotor and the stator. And the center of rotation of the rotor.

However, in such a configuration, a space for forming a through hole in the center of the rotor and the stator must be secured, so that the entire mode switch becomes large. An object of the present invention is to reduce the size of a mode switch.

[0007]

[Means for Solving the Problems]

 The mode switch according to the first aspect is a mode switch that is rotated according to the operation mode of the cassette deck, and includes a stator and a rotor. The stator has a contact forming surface on which a plurality of contacts are formed. The rotor has a disk shape having a slider that can contact each contact on a surface facing the contact forming surface of the stator. Then, the stator and the rotor are rotatably fitted on the outer peripheral side of the contact forming surface, and are mutually positioned in the radial direction.

In this mode switch, the rotor rotates with respect to the status according to the mode of the cassette deck. Here, the rotor is radially positioned by being rotatably fitted to the stator. For this reason, it is not necessary to secure the space for providing the through-hole in the rotor unlike the related art. Therefore, the size of the rotor can be reduced, and the cost for manufacturing the mode switch can be reduced.

According to a second aspect of the present invention, there is provided the mode switch according to the first aspect, wherein the stator has an annular wall formed on an outer peripheral side of the contact forming surface so as to protrude in a direction orthogonal to the contact forming surface. ing. The rotor is rotatably disposed on the inner peripheral side of the annular wall with the inner peripheral surface of the annular wall serving as a guide surface. In this mode switch, the rotor rotates with the inner peripheral surface of the annular wall of the stator as a guide surface. Here, since the rotor is supported and positioned by the annular wall portion of the stator, it is not necessary to secure a space for providing a through hole in the rotor as in the related art.

A mode switch according to a third aspect is the mode switch according to the second aspect, wherein a male screw portion is formed on an outer peripheral portion of the rotor. At least a part of the inner peripheral portion of the annular wall portion of the stator is formed with a female screw portion to which the male screw portion of the rotor is screwed. In this mode switch, when the rotor is mounted on the stator, the external thread on the outer periphery of the rotor is screwed into the internal thread on the annular wall of the stator. In this case, the screwing of the threaded portions ensures the positioning, and also has the effect of retaining the screws.

A mode switch according to a fourth aspect is the mode switch according to the third aspect, wherein the female screw portion of the annular wall portion is a part of the inner peripheral portion of the annular wall portion that is closer to the contact forming surface. It is formed in. The portion where the female screw portion is not formed is an annular flat surface. Here, the processing of the screw portion can be shortened. Also, the amount of screwing in the rotor mounting and holding is smaller than when the internal thread is formed on the entire annular wall, and the time required for assembly can be reduced.

A mode switch according to a fifth aspect of the present invention is the mode switch according to any one of the second to fourth aspects, further comprising a disc-shaped recess into which the annular wall portion of the stator is inserted, and the mode switch is provided around the annular wall portion. It further includes a cam rotatably disposed for rotating the rotor in accordance with the operation mode. A chamfer is formed on the outer peripheral side of the tip of the annular wall portion of the stator, and a chamfer is formed on an opening edge of the disc-shaped concave portion of the cam.

In this mode switch, at the time of assembly, the cam is mounted on the stator such that the annular wall of the stator is housed in the disc-shaped recess of the cam. At this time, the opening edge of the disc-shaped concave portion of the cam comes close to or abuts on the outer peripheral side of the tip of the annular wall portion. It can be inserted smoothly into the plate-shaped recess and assembled.

A mode switch according to a sixth aspect of the present invention is the mode switch according to the first aspect, wherein the stator has a disk-shaped projection, and the rotor has a disk-shaped recess into which the disk-shaped projection is fitted. ing. In this mode switch, the disk-shaped protrusion of the stator is rotatably fitted and positioned in the disk-shaped recess of the rotor, so that the rotor has a space for providing a through hole as in the conventional case. No need to secure.

A mode switch according to a seventh aspect is the mode switch according to the sixth aspect, wherein a male screw portion is formed on an outer periphery of the disk-shaped protruding portion of the stator. On the inner peripheral surface of the disk-shaped concave portion of the rotor, a female screw portion with which the male screw portion of the disk-shaped protrusion is screwed is formed. In this mode switch, the rotor is positioned with respect to the stator by screwing into the stator. Therefore, it is not necessary to secure a space for providing a through hole or the like at the center of the rotor, and the mode switch can be downsized. Further, an effect of retaining is obtained.

The mode switch according to claim 8 is the mode switch according to any one of claims 3, 4, and 7, wherein the slider gradually moves away from the surface of the rotor in a direction opposite to the screwing direction of the rotor. Extending. In this mode switch, since the slider gradually extends away from the rotor surface in the direction opposite to the screwing direction of the rotor, the slider may not catch on the contact when screwing in when the rotor is mounted. Absent.

A mode switch according to a ninth aspect of the present invention is the mode switch according to the seventh aspect, further comprising a disc-shaped recess into which the rotor is inserted, the mode switch being rotatably disposed around the stator together with the rotor. Is further provided with a cam for rotating according to the operation mode. A chamfer is formed at an outer peripheral end of a surface of the rotor on the disk-shaped concave side of the cam. A chamfer is formed at the opening edge of the disc-shaped concave portion of the cam.

In this mode switch, the cam is mounted on the rotor such that the rotor is housed in the disc-shaped concave portion of the cam. At this time, the end face on the opening side of the disc-shaped recess of the cam and the outer peripheral end of the face of the rotor facing the disc-shaped recess come close to or come into contact with each other, and these faces are chamfered to each other. . Therefore, the rotor is smoothly accommodated in the disc-shaped concave portion of the cam.

[0019]

[Embodiment of the invention]

 First Embodiment FIG. 1 shows a mode switch 1 according to an embodiment of the present invention. The mode switch 1 is a switch for identifying which of the operation modes of the video deck (not shown) such as reproduction, rewinding, cassette storage, and the like. The mode switch 1 is mounted on a printed circuit board (hereinafter, referred to as “PCB”) 15 disposed near an operation unit (not shown) of the video deck, and includes a stator 3, a rotor 5, and a deck cam 7. And

The stator 3 is a plate-like member mounted on the PCB 15 disposed near the operation unit, and has an upper surface on which an annular wall portion 4 for holding the rotor 5 is upward, that is, orthogonal to the upper surface. It is formed to protrude in the direction. A female screw portion 4a is formed at a lower portion of the inner peripheral surface of the annular wall portion 4. In addition, an annular flat surface portion 4b that is flat in the axial direction and has no female screw portion is formed on the upper portion of the inner peripheral surface. A chamfer 4c is formed on the outer peripheral side of the distal end of the annular wall portion 4.

Further, a plurality of terminals 9 formed to be mountable on the PCB 15 are provided at opposite ends of the stator 3. Each of the plurality of terminals 9 extends from the end of the stator 3 to the center thereof, and has a plurality of flat contacts 11 on the inner peripheral side of the annular wall portion 4. The plurality of contacts 11 extend in the circumferential direction and the radial direction to form a pattern, and a desired resistance can be obtained by sliding a later-described slider 6 on a contact forming surface on which the contact pattern is formed. It has become.

The rotor 5 is a disk-shaped member having a diameter slightly smaller than the inner diameter of the annular wall 4, and is turned around the inner peripheral side of the annular wall 4 using the inner peripheral surface of the annular wall 4 as a guide surface. It is arranged movably. That is, a male screw portion 5a for screwing with the female screw portion 4a of the annular wall portion 4 is formed on the outer peripheral portion of the rotor 5, and positioning in the radial direction is performed by screwing the screw portions 4a, 5a. It has been done. A slider 6 that can contact a plurality of contacts 11 is fixed to the lower surface of the rotor 5. The slider 6 is a flexible member made of metal, and has a fixed end 6a, a sliding portion 6b, and an open end 6c as shown in FIG. The fixed end 6a is fixed to the lower surface of the rotor 5. The sliding portion 6c is a portion formed to extend from the fixed end 6a in a direction opposite to the screwing direction P of the rotor 5 and obliquely downward, that is, gradually away from the lower surface of the rotor 5. The open end 6c is a portion raised upward from the lower end of the sliding portion 6b. At the radial end of the upper surface of the rotor 5, a projection 5b for engaging with the deck cam 7 is formed to protrude upward.

The deck cam 7 is a disc-shaped member that is rotated according to each operation mode of the deck. On the lower surface of the deck cam 7, a disc-shaped recess 7a for accommodating the rotor 5 and the annular wall 4 is formed. The disc-shaped recess 7 a has a diameter slightly larger than that of the annular wall 4 so that the deck cam 7 cannot swing in the radial direction with respect to the annular wall 4. An engagement hole 7b into which the protrusion 5a of the rotor 5 is inserted is formed at a predetermined position on the upper end of the disc-shaped concave portion 7a. The engagement hole 7b is formed to have a diameter slightly larger than the protrusion 5a of the rotor 5. Therefore, the rotor 5 can rotate following the deck cam 7. A chamfer 7c is formed at the opening edge of the disc-shaped recess 7a.

The circuit of the PCB 15 is connected to a control unit (not shown), and the control unit is further connected to a display unit, a reproducing device, a rewinding device (none is shown), and the like. Next, how to assemble the mode switch 1 will be described. First, in order to mount the rotor 5 on the stator 3, the rotor 5 is mounted on the inner peripheral portion of the annular wall portion 4. At this time, the rotor 5 passes through the inner peripheral side of the flat portion 4b of the annular wall portion 4 and contacts the female screw portion 4a. From this state, the male screw portion 5a of the rotor 5 is screwed into the female screw portion 4a of the stator 4. Thereby, the rotor 5 can be fixed to the stator 4.

Here, since the slider 6 is formed to extend in the direction opposite to the screwing direction of the rotor 5, it is possible to prevent the slider 6 and the contact from being caught when the rotor 5 is screwed. The rotor 5 can be smoothly screwed in and mounted. Here, it is desirable that the deck cam 7 and the stator 3 are arranged in a non-contact state so that a load is not applied to the deck cam 7.

Next, the protrusion 5 b of the rotor 5 is inserted into the engagement hole 7 b of the deck cam 7, and the annular wall 4 of the stator 3 is arranged in the disc-shaped recess 7 a of the deck cam 7. Next, the respective members are positioned, and the deck cam 7 is placed on the stator 3 from above. In such an assembling operation, since the female screw portion 4a of the annular wall portion 4 is formed not at the entire inner periphery but at a part of the lower portion thereof, the screwing amount when the rotor 5 is mounted is small. Therefore, the time required for assembly can be reduced. Also, the processing or manufacturing of the thread is simplified.

When the annular projection 4 of the rotor 5 and the deck cam 7 are assembled while being fitted together, chamfers 4c and 7c are formed at the collision portions of the two, so that both are smoothly fitted. Can be combined. Next, the operation of the mode switch 1 will be briefly described. When the operation mode of the video deck is switched (cassette insertion / ejection, playback, fast-forward, rewind, etc.), the deck cam 7 rotates in response thereto. Then, the protrusion 5b of the rotor 5 is guided by the engagement hole 7b of the deck cam 7 and moves in the circumferential direction, and the rotor 5 rotates relative to the stator 3 by a predetermined angle. As a result, the connection between the plurality of contacts 11 is switched, and the resistance is changed according to the operation mode. Then, the signal changed by the mode switch 1 is sent to the control unit and the display unit, and the current operation mode (the state of the deck) is detected, and processing according to each operation mode is performed.

In the mode switch 1, the rotor 5 rotates with the inner peripheral surface of the annular wall portion 4 of the stator 3 as a guide surface according to the operation mode of the cassette deck. That is, the rotor 5 is positioned with respect to the stator 3 by the outer peripheral portion being supported by the annular wall portion 4. The center of rotation of the deck cam 7 and the center of rotation of the rotor 5 are aligned by the disc-shaped recess 7 a of the deck cam 7 and the annular wall 4 of the stator 3. Therefore, unlike the conventional rotor, it is not necessary to secure a space for providing a through hole and a rotation supporting portion in the rotor 5, and the rotor 5 can be formed small. And the cost for manufacturing the mode switch 1 can be reduced.

[Second Embodiment] Here, a description will be given focusing on differences from the first embodiment. FIG. 3 shows a mode switch 1 employing the second embodiment of the present invention. In place of the annular wall 4 of the first embodiment, a disk-shaped protruding portion 31 having a male screw portion 3a formed on the outer periphery is formed on the upper surface of the stator 3.

On the lower surface of the rotor 5, there is formed a disc-shaped recess 51 that can accommodate the disc-shaped protrusion 3 b of the stator 3, and the inner periphery of the disc-shaped recess 51 has a circle of the stator 3. A female screw portion 5c to which the male screw portion 3a of the plate-like protrusion 31 is screwed is formed. A chamfer 5d is formed all around the outer peripheral end of the upper surface of the rotor 5. Similarly, a disc-shaped recess 7a is formed in the deck cam 7, and a chamfer 7c is formed at an opening edge (an outer end surface of the recess 7a).

When assembling the mode switch 1, first, the female thread 5 c of the rotor 5 is screwed into the male thread 3 a of the stator 3, and the rotor 5 is mounted on the stator 3. Thus, the rotor 5 is positioned with respect to the stator 3. Next, the deck cam 7 and the rotor 5 are positioned with respect to each other such that the rotor 5 is housed in the disc-shaped concave portion 7a of the deck cam 7. The deck cam 7 is mounted so as to cover it from above the rotor 5. At this time, even if the inner peripheral edge of the lower surface of the deck cam 7 and the outer peripheral edge of the upper surface of the rotor 5 abut, the chamfers 7c, 5d Since these are formed, they can be smoothly mounted by being guided by these chamfers.

Other Embodiments (a) In the embodiment, the annular wall 4 is formed continuously in the circumferential direction. However, the annular wall 4 may be divided. (B) The mode switch 1 can be used for an apparatus having a plurality of operation modes other than the cassette deck.

[0033]

[Effect of the invention]

 According to the present invention, it is not necessary to secure a space for providing a through hole in the rotor and the stator, so that the mode switch can be downsized.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a mode switch employing a first embodiment of the present invention.

FIG. 2 is a perspective view showing a rotor and a slider of the mode switch.

FIG. 3 is a longitudinal sectional view showing a mode switch employing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mode switch 3 Stator 4 Annular wall part 4a Female screw part 4b Plane part 4c, 5d, 7c Chamfer 5 Rotor 5a Male screw part 6 Slider 7 Deck cam 7a Disc-shaped recess 11 Plural contacts 51 Disc-shaped recess

Claims (9)

[Utility model registration claims] 1. A mode switch rotated in accordance with an operation mode of a cassette deck, comprising: a stator having a contact forming surface on which a plurality of contacts are formed; A disk-shaped rotor having a slider capable of contacting each contact, wherein the stator and the rotor are radially positioned with respect to each other by being rotatably fitted on an outer peripheral side of the contact forming surface. Mode switch on the cassette deck. 2. The stator according to claim 1, wherein the stator has an annular wall protruding in a direction perpendicular to the contact forming surface on an outer peripheral side of the contact forming surface, and the rotor has an inner peripheral side of the annular wall. 2. The annular wall portion is rotatably disposed with the inner peripheral surface as a guide surface.
The mode switch of the cassette deck described in. 3. An external thread portion is formed on an outer peripheral portion of the rotor, and a female screw portion with which the external thread portion of the rotor is screwed is formed on at least a part of an inner peripheral portion of the annular wall portion of the stator. 3. The mode switch of the cassette deck according to claim 2, wherein the mode switch is formed. 4. A female screw portion of the annular wall portion is formed on a part of an inner peripheral portion of the annular wall portion closer to the contact forming surface, and the female screw portion is formed. 4. The mode switch of claim 3, wherein the missing portion is an annular flat surface. 5. A stator having a disk-shaped recess into which an annular wall portion of the stator is inserted, and rotatably disposed around the annular wall portion for rotating the rotor in accordance with an operation mode. 5. The vehicle according to claim 2, further comprising a cam, wherein a chamfer is formed on an outer peripheral side of an end of the annular wall portion of the stator, and a chamfer is formed on an opening edge of the disc-shaped concave portion of the cam. The mode switch of the cassette deck described in. 6. The cassette deck mode according to claim 1, wherein said stator has a disk-shaped projection, and said rotor has a disk-shaped recess in which said disk-shaped projection is fitted. switch. 7. A male screw portion is formed on an outer periphery of the disk-shaped protrusion of the stator, and a male screw portion of the disk-shaped protrusion is formed on an inner peripheral surface of the disk-shaped recess of the rotor. The mode switch of the cassette deck according to claim 6, wherein a female screw portion to be screwed is formed. 8. The mode switch of a cassette deck according to claim 3, wherein said slider extends gradually away from the surface of said rotor in a direction opposite to a screwing direction of said rotor. . 9. A cam having a disc-shaped recess into which the rotor is inserted, the cam being provided rotatably with the rotor around the stator, and for rotating the rotor in accordance with an operation mode. 8. The cam of claim 7, wherein a chamfer is formed at an outer peripheral end of a surface of the rotor on the disk-shaped concave side of the rotor, and a chamfer is formed at an opening edge of the disk-shaped concave portion of the cam. 9. Mode switch on the cassette deck.