JPH0538499Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a switch button click mechanism suitable for use in a switch installed in a video camera, for example.

[Summary of the idea]

This invention improves the click feeling and prevents malfunctions in the switch button click mechanism by pressing the tact switch using a lever mechanism in which the distance from the fulcrum to the point of action is longer than the distance from the fulcrum to the point of force. This is how it was done.

[Prior Art] A video camera is provided with a recording button that is operated when starting recording. FIG. 7 shows an example of a record button of such a conventional video camera.

In Fig. 7, 101 is a tact switch;
2 is a push button. As the tact switch 101, a noise-reducing type whose switch operating portion 108 is covered with rubber is used. Tact switch 101
is arranged on the substrate 103. Cabinet 10
A recess 105 is formed in 4, and a through hole 106 is formed in the center of the recess 105. This through hole 106
The shaft of the push button 102 is inserted into the recess 105, and the head of the push button 102 is fitted into the recess 105. A coil spring 107 is inserted between the bottom surface of the head of the push button 102 and the bottom surface of the recess 105.

When push button 102 is not pressed, push button 1
02 is urged by the coil spring 107 and moved to the left. For this reason, tact switch 1
The switch operation section 108 of 01 is not pressed. When the push button 102 is pressed, the shaft of the push button 102 moves into the switch operating section 108 of the tact switch 101.
is pressed to turn on the tact switch 101.

[Problem that the invention attempts to solve]

The recording button of a video camera is provided on the back of the main body of the camera, and is often operated with the thumb of the right hand. Although the thumb is stronger than the other fingers, it is less sensitive. For this reason, the record button on the video camera is
A click mechanism that provides a sufficient click sensation is required, and if the click sensation is not sufficient, there is a risk of erroneous operation.

The record button of a conventional video camera is set by pressing the switch operation part 108 of the tact switch 101 and pressing the button 10.
2, it was difficult to obtain a sufficient click feeling.

Therefore, the object of this invention is to provide a switch button click mechanism that provides a sufficient click feeling and prevents erroneous operation.

[Means for solving problems]

This device consists of a lever mechanism in which a plate member 34 is rotatably fixed, a tact switch 31 disposed at the point of action of the lever mechanism, and a push button member 22 disposed at the point of force of the lever mechanism. This is a switch button click mechanism in which the distance from the fulcrum to the point of action is longer than the distance from the fulcrum to the point of force.

[Effect]

When the push button 22 is pressed, the raised portion 39 of the lever member 34 is pressed, and the switch operating portion 31a of the tact switch 31 is pressed by the end portion 34a of the lever member 34. From the end 34b of the lever member 34 to the end 34
Since the distance to a is longer than the distance from the end 34b to the raised portion 39, this increases the pressing force and shortens the stroke. Therefore, the change in pressing force becomes significant, and the click feeling is improved.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

4 and 5 show the overall configuration of a camera-integrated VTR to which this invention is applied. In Figures 4 and 5, 1 is a camera integrated type.
This is the main body of the VTR, and numeral 2 is a grip body for gripping the camera-integrated VTR main body 1 when taking pictures.

A camera section 5 and a VTR section 6 are housed inside the main body case 3, and a front surface 3a of the main body case 3 is also housed.
A window frame is fixed at a position slightly set back from the front surface 3a, facing a rectangular window hole 8 formed in the upper part of the camera, and the objective lens 7 of the camera section 5 is exposed to the outside by this window frame. . And this front 3
A dustproof cover 9 is attached to the rear side of the window frame plate 3a by appropriate means so as to be able to slide vertically, and its upper edge is slightly higher than the window frame 8 on the front side 3a. It protrudes outward and serves as a knob portion 10 of the cover 9.

The cover body 11 is aligned so that it has the same outline as the main body case 3 from the top surface 3c of the main body case 3 to the left side surface 3e.
is attached, which is rotatable with respect to the main body case 3 using its lower edge as a hinge, and when the lid 11 is open, the cassette mounting part (not shown) of the VTR unit 6 is attached. ) so that a tape cassette (not shown) can be detachably attached to the tape cassette (not shown).

On the other hand, in the case of the grip body 2, an optical view indexer 1 is provided in the upper part of the grip housing 4.
2 is included. Reference numeral 13 denotes the objective lens, which is located at the upper part of the front surface 4a of the grip housing 4.
It is exposed to the outside through a window frame 14 formed therein. At the upper end of the rear surface of the grip case 4, there is a so-called eye cup 15 formed of an elastic material.
is attached, which includes an eyepiece (not shown).
is attached, and an optical system is thus formed between the objective lens 13 and the eyepiece lens, and an optical viewfinder 12 is constructed. Note that this optical view finder 12 is completely independent of the optical system including the objective lens 7 of the camera section 5 described above.

A battery 16 is removably housed within the grip housing 4. Reference numeral 17 denotes an inlet/outlet for the battery 16, which is formed on the front surface 4a of the grip casing 4. A band 19 is attached to the grip housing 4 so as to face the right side 4f of the grip housing 4, and the photographer inserts his/her right hand between the band 19 and the grip housing 4 to open the grip housing 4. body 4
It is designed to hold.

The right side surface of the main body case 3 and the left side surface of the grip case 4 are connected side surfaces that face each other, and a connecting means is formed on each of these surfaces. As shown in FIG. 5, a lever 21 is provided on the rear surface 4b of the grip case, and by operating this lever 21, the main body 1 and the grip body 2 can be separated. Further, a push button for a recording switch is provided on the rear surface 4b of the grip housing 4. When this push button 22 is lightly pressed, it enters a standby state, and when pressed more strongly, the tape runs and recording is performed.

The push button 22 for the recording switch will be described in detail. 1, 2, and 3 show the vicinity of the push button 22 inside the rear surface 4b of the main body case 3. FIG.
In FIGS. 1 to 3, 31 is a tact switch, and 32 is a leaf switch. The tact switch 31 is a switch that controls the start of recording.
The leaf switch 32 is a switch that sets a standby state. As the tact switch 31, a noise-reducing type whose switch operating portion 31a is covered with rubber is used. Tact switch 31
is arranged on the substrate 30. leaf switch 3
2 is fixed to the left side surface 4e of the main body case 4. 3
4 is a lever member. One end 34b of the lever member 34
is rotatably fixed by a boss 36 projecting inward from the left side surface 4e of the grip housing 4.

As shown in FIGS. 2 and 3, a recess 37 into which the head 22a of the push button 22 is fitted is formed on the rear surface 4b of the main body case 4, and a through hole 3 is formed in the center of the recess 37.
8 is formed. The position of this through hole 38 corresponds to a protrusion 39 formed on the lever member 34. The shaft portion 21b of the push button 22 is inserted into the through hole 38, and the head portion 22a of the push button 22 is fitted into the recess 37. A coil spring 40 is inserted between the bottom surface of the head 22a of the push button 22 and the bottom surface of the recess 37.
When the head 22a of the push button 22 is pressed, the shaft portion 22b of the push button 22 is pushed against the lever member 34, as shown in FIG.
It comes into contact with the protrusion 39 of.

A protruding piece 41 is provided to extend from the end 34a of the lever member 34. Leaf switch 3 is attached to this protruding piece 41.
The second switch piece 32a is brought into contact with the second switch piece 32a. Lever member 3
4 is urged upward by the elasticity of this leaf switch 32.

Note that 42 and 43 are protrusions for regulating the range of movement of the lever member 34.

When the push button 22 is lightly pressed, the shaft portion 2 of the push button 22
2b comes into contact with the raised portion 39 of the lever member 34, and the lever member 34 is swung in the direction indicated by arrow A. As a result, the switch piece 32a of the leaf switch 32
is brought into contact with the switch piece 32a, and the standby state is set. If you push the push button 22 even harder, the third
As shown in the figure, the end portion 34a of the lever member 34 presses the switch operation portion 31A of the tact switch 31, and the recording state is set.

Note that the raised portion 39 of the lever member 34 that the shaft portion 22b of the push button 22 comes into contact with has a circular shape.
There is always a line contact, and play is less likely to occur.

As described above, when the push button 22 is lightly pushed, the leaf switch 32 is turned on and the standby state is set, and when the push button 22 is further pushed, the tact switch 31 is turned on and the recording state is set. Since the tact switch 31 is pressed through the lever member 34, the click feeling is improved and erroneous operation is prevented.

That is, the fulcrum of the lever mechanism consisting of the lever member 34 is the end portion 34b of the lever member 34, and the point of effort is the raised portion 39 that the shaft portion 22b of the push button 22 comes into contact with.
The point of action is the end portion 34a of the tact switch 31 that comes into contact with the switch operating portion 31a. The distance from the end portion 34b to the end portion 34a is longer than the distance from the end portion 34b to the raised portion 39, and the ratio of the lengths is, for example, (2.2:1). Therefore, by providing the lever member 34, the force with which the push button 22 presses the tact switch 31 can be reduced, for example.
2.2 times is required, and the stroke is (1/2.2)
become. That is, FIG. 6 shows the relationship between the force with which the push button 22 is pressed and the stroke. In FIG. 6, the horizontal axis shows the stroke, the vertical axis shows the force, _A1 shows the relationship when the lever member 34 is provided, and _A2 shows the relationship when the lever member 34 is not provided and the tact switch 31 is directly connected. This shows the relationship when pressed. For simplicity of explanation, the drag force of the coil spring 40 will be ignored, and the stroke will be zero when the shaft portion 22 of the push button 22 comes into contact with the raised portion 39.

When the lever member 34 is provided, the stroke l ₁ until the tact switch 31 is turned on becomes shorter than the stroke l ₂ when the lever member 34 is not provided, and the pressing force F ₁ at that time is the same as that of the lever member 3.
This is larger than the pressing force F ₂ when 4 is not provided. Therefore, as is clear from FIG. 6, when the lever member 34 is provided, the tact switch 31
When turned on, the change in pressing force with respect to the stroke becomes remarkable, and the click feeling is improved.

[Effect of idea]

According to this invention, the tact switch is pressed using a lever mechanism in which the distance from the fulcrum to the point of application is longer than the distance from the fulcrum to the point of force, so the click feeling is improved and erroneous operation is prevented.

[Brief explanation of the drawing]

Fig. 1 is a plan sectional view of an embodiment of this invention, Figs. 2 and 3 are side sectional views of an embodiment of this invention, and Figs. 4 and 5 are views of a camera to which this invention is applied. FIG. 6 is a perspective view of a body type VTR, FIG. 6 is a graph showing the effects of an embodiment of this invention, and FIG. 7 is a sectional view showing an example of a conventional switch button click mechanism. Explanation of main symbols in the drawings: 22... push button, 31... tact switch, 32... leaf switch, 34... lever member.

Claims (1)

[Scope of Claim for Utility Model Registration] A lever mechanism formed by rotatably fixing one end of a plate-shaped member, a tact switch disposed at the point of action of the lever mechanism, and a push button disposed at the point of force of the lever mechanism. a semicircular protuberance that contacts when pressed by the push button member and is disposed at the force point of the lever mechanism; and a turn that restricts the rotation range of the lever mechanism that rotates in response to the press of the push button member. A switch button click mechanism comprising a motion regulating member, the distance from a fulcrum to the point of action being longer than the distance from the fulcrum to the point of force.