JP2529716B2 - Electronic device operating device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tuning dial of a portable radio and an operating device for electronic equipment such as a tuning mechanism interlocking with the tuning dial.

[Conventional technology]

Conventionally, for example, a tuning mechanism of a portable radio performs tuning by driving a gear provided on a tuning variable resistor with a tuning dial and a gear provided coaxially with the tuning dial. At both ends of the tuning range, the concave and convex portions provided inside the gear come into contact with the stoppers so that the tuning dial does not rotate.

[Problems to be Solved by the Invention]

In the case of the above-mentioned conventional technique, the tuning mechanism is thinned and the mechanical strength is low due to the demand for downsizing and weight saving of portable electronic devices. Therefore, when the user tries to forcibly turn the tuning dial, the stopper mechanism is used. May be broken. Especially for portable electronic devices,
I often turn the dial by groping while putting it in a pocket or bag, and sometimes I turn the dial with force even though it is the end, and I sometimes break the stopper.

The present invention has been made in view of the above-described problems of the conventional technology, and has a good operability, and even if a strong force is applied to the operation dial, a gear or a stopper interlocked with the operation device is not damaged. The purpose is to provide.

[Means for solving the problem]

This invention provides a drive gear made of synthetic resin that interlocks with an operation dial provided in an electronic device, and a driven gear made of synthetic resin that transmits drive force to a movable part of the variable element that meshes with the drive gear. At both ends of the portion of the driven gear that meshes with the drive gear, low tooth portions with relatively short tooth length are provided.
A slit is formed from the center of the low-toothed portion toward almost the center of the gear, and a through hole is formed on both sides of the slit on the center side of the driven gear in the low-toothed portion, the through-hole communicating with the slit. An operating device for an electronic device, which is provided with a stopper for stopping the rotation of the driven gear, and in which the through hole of each low tooth portion is formed so that the side close to the portion that does not mesh with the drive gear is elongated in the circumferential direction on the basis of each slit. Is.

[Action]

In the operating device for electronic equipment of the present invention, even when the operating dial of the electronic equipment reaches the end of the operating range, the drive gear and the driven gear slip each other at the low tooth portion, and the operating dial rotates, but the gear is rotated. A structure that prevents excessive force from being applied to the stoppers, stoppers, etc., and further has different optimum deflection amounts on both sides of the slit in each low tooth part so that it can be properly reversed after slipping. Is.

〔Example〕

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

This embodiment relates to a tuning operation device for a portable radio, and as shown in FIG.
A tuner board 2 in which a tuning circuit (not shown) is formed is provided inside the tuner board 2.
Further, an operation dial 3 which is rotatably attached to the case 1 and whose peripheral edge is partially exposed from the case 1 is provided. A drive gear 4 is formed on the operation dial 3 coaxially and integrally therewith, and the drive gear 4 is a driven gear rotatably provided with respect to the tuner substrate 2 for variable resistance. It meshes with the gear 5. A slider 6 which is in sliding contact with a resistor (not shown) on the tuner substrate 2 is fixed to the front side of the variable resistance gear 5 in the drawing, and on the back side thereof, as shown in FIG. A gear 7 having a smaller diameter than that of the gear 5 is formed integrally with the gear 5. The gear 7 meshes with a pointer rack 10 that is integral with a pointer 9 that moves within the frequency display portion 8 of the tuner.

Further, a part of the teeth of the variable resistance gear 5 has a low tooth portion 11 whose tooth length is formed to be half that of the other teeth at two predetermined close positions,
It is 12. The positions of the low tooth portions 11 and 12 are the moving range of the pointer rack 10, that is, the position where the drive gear 4 integrated with the operation dial 3 engages when the pointer 9 comes to the start end and the end. Then, slits 13 and 14 are formed in the central portions of the low tooth portions 11 and 12 toward the center of rotation, respectively.
Through holes 15 and 16 are formed so as to extend from one end of 3, 14 to both sides thereof. The through holes 15 and 16 are formed so that the portions facing each other are long with respect to the slits 13 and 14. Further, an arcuate groove 17 is formed in the inner peripheral portion of the gear 7, and both ends of the groove 7 are formed with stoppers 18 that engage with a protrusion (not shown) on the case 1.

In the tuning operation device of this embodiment, when the position of the pointer 9 shown in FIG.
Is in a state of biting. In this state, no matter how many times the operation dial 3 is rotated counterclockwise, the stopper 18 contacts the convex portion on the case 1 and the variable resistance gear 5 does not rotate any more. Then, in the operation dial 3, the drive gear 4 integrated with the operation dial 3 rides over the teeth of the low tooth portion 11 of the variable resistance gear 5 and idles, so that an unreasonable force is not applied to the stopper 18. Here, when the drive gear 4 gets over the low tooth portion 11, the low tooth portion 11
Is driven by the counterclockwise rotation of the drive gear 4 so that the low-toothed portion 11 sandwiches the slit 13 and bends toward the through hole 15. This deflection is large on the counterclockwise side across the slit 13.

On the contrary, when the operation dial 3 is rotated clockwise, the drive gear 4 rotates the variable resistance gear 5 counterclockwise to enable tuning. At this time, the low tooth part 11
Is slightly engaged with the drive gear 4 so that the rotation of the drive gear 4 is sufficiently transmitted.

Then, when the operating dial 3 is turned clockwise and steadily until the pointer 9 reaches the end, the drive gear 4 meshes with the low tooth portion 12 of the variable resistance gear 5. Then, the rotation of the variable resistance gear 5 is stopped by the stopper 18, and no matter how much the operation dial 3 is rotated clockwise, the low tooth portions 12 sandwich the slit 14 and the through holes 16 are formed in the same manner as above. The drive gear 4 and the operation dial 3 are deflected toward the left side and idle.

According to the tuning operation device of this embodiment, even if the user turns the operation dial 3 forcibly, the operation dial 3 does not idle at the end of tuning and the gears and the stopper of the tuning mechanism are not damaged. Moreover, when the drive gear 4 gets over the low-teeth portions 11 and 12, there is a click feeling, and the user should know that the user has reached the end of tuning 9
You can easily know without looking at it.

The present invention may be used not only for the tuning mechanism of the radio, but also for other variable resistors and variable capacitors, and can be used for the rotating operation mechanism of various electronic devices.

Further, the positions and shapes of the low tooth portions, the slits and the through holes may be appropriately set depending on the application of the gear, the applied force and the like.

〔The invention's effect〕

In the operating device for electronic equipment according to the present invention, even if the driven gear that interlocks with the start end and the end of the operation dial is stopped by the stopper, the drive gear that interlocks with the operation dial slips at the low tooth portion of the driven gear. Since it rotates idly, the stopper and gears will not be damaged even if the operation dial is turned forcibly. Also, for each low tooth portion, the deflection on the side close to the portion that does not mesh with the drive gear is relatively large based on the slit, and the deflection on the side close to the portion that meshes with the drive gear on the opposite side is relatively small. By doing so, the drive gear of the operation dial meshes well from the maximum rotation position of the driven gear, and the slip state is reliably restored, so that the driven gear can be reversed. Moreover,
No special slip mechanism is provided between the operation dial and the gears, or between the gears, and the structure is simple and the number of members is not increased, which greatly contributes to the reduction in size and thickness of electronic equipment.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of a tuning operating device according to an embodiment of the present invention, FIG. 2 is a front view of a driven gear according to this embodiment, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. Is a rear view of the driven gear of this embodiment, and FIG. 5 is a bottom view of the driven gear of this embodiment. 3 ... Operation dial, 4 ... Drive gear, 5 ... Variable resistance gear (driven gear), 11, 12 ... Low tooth portion, 13, 14 ... Slit, 15, 16 ... Through hole, 18 ... …stopper

Claims (1)

(57) [Claims] 1. An operation dial provided in an electronic device, a synthetic resin drive gear interlocking with the operation dial, and a synthetic resin transmission mechanism for transmitting a driving force to a movable part of a variable element which meshes with the drive gear. The driven gear, low tooth portions having relatively short tooth lengths provided at both ends of a portion of the driven gear that meshes with the drive gear, and formed from the central portion of the low tooth portion to the substantially central portion of the gear. Each of the low teeth includes a slit, a through hole formed on both sides of the slit at the center side of the driven gear in the low tooth portion and formed in communication with the slit, and a stopper for stopping the rotation of the driven gear. The electronic device operating device is characterized in that the through hole of the portion is formed such that the side close to the portion that does not mesh with the drive gear is elongated in the circumferential direction with respect to each slit as a reference.