JPH11317131A - Rotary pulse generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize the shape of a rotary pulse generator. SOLUTION: This pulse generator has a multiplicity of slits S formed in the circumferential direction on a rotary disk 16 rotating by a rotary shaft 17, and pulses are generated by intermittently cutting off light passing through an optical switch by the slits S. A biasing spring for imparting biasing force to the rotary shaft in its axial direction is stored within a tubular shaft part 16A formed on the axis of the rotary disk 16 and imparts the biasing force to the rotary shaft 17 by being engaged with the rotary shaft 17 within the tubular shaft part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary pulse generator used as a setting device for changing a setting state of a digital circuit or the like.

[0002]

2. Description of the Related Art Conventionally, for example, in a temperature control device or the like, a rotary setting device provided with a rotary knob is provided, and in many cases, the temperature is set by the rotary setting device. In an analog circuit, a slide resistor such as a potentiometer is used as the setting device, but in a digital circuit, a rotary pulse generator is used.

In this type of rotary pulse generator, a rotary disk having a plurality of slits formed in a cylindrical case is provided. By rotating this rotary disk with a knob, an optical switch is intermittently controlled by the slit. The number of pulses corresponding to the amount of rotation of the rotating disk is generated, and the set value is changed according to the number of pulses. In this case, the pulse is output as a two-phase pulse, and the rotation direction of the rotating disk is detected based on the phase of the two-phase pulse, and it is determined whether the set temperature is increased or decreased according to the rotation direction.

By the way, in the digital circuit, when the setting of the numerical value is completed, it is necessary to input a signal indicating that the setting is completed. For this reason, conventionally, the rotating shaft is slidably supported in the axial direction, and a biasing spring such as a coil spring or a leaf spring is inserted between the rotating disk and the rotating shaft so that the rotating shaft projects from, for example, a cylindrical case. When a biasing force is applied in the direction to be made and the rotating shaft is pushed into the case in a cylindrical shape, the push button switch is pressed by the tip of the rotating shaft,
A signal indicating that the setting is completed is transmitted by the contact signal of the push button switch.

[0005]

As described above, the rotary pulse generator has a structure for performing two operations of rotating the rotating shaft and pushing the shaft in the axial direction. Therefore, as described above, since the biasing spring must be inserted between the rotating disk and the rotating shaft, there is a disadvantage that the shape of the cylindrical case becomes large.

In other words, conventionally, a coil spring is disposed on the outer peripheral portion of the shaft of the rotating disk (between the position where a large number of slits for pulse generation are formed and the shaft), and the coil spring exerts an axial biasing force on the rotating shaft. Is given. By adopting a structure in which the coil spring is arranged on the outer peripheral portion of the shaft of the rotating disk in this manner, a mechanism for engaging the coil spring between the outer peripheral portion of the shaft of the rotating disk and the position where the pulse generating slit is formed. The disadvantage is that the diameter of the rotating disk must be large because the joints must be formed, resulting in the need to increase the diameter of the cylindrical case, resulting in a large overall shape. There is.

In order to solve this drawback, a structure using a leaf spring as a spring for applying a biasing force to the rotary shaft has been considered. However, when a leaf spring is used, the biasing force applied to the rotary shaft is set to a desired value. There are drawbacks that are difficult to set. That is, there arises a problem that the operating force required for the pressing operation varies greatly for each product. SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary pulse generator having a structure capable of miniaturizing the shape of a rotary pulse generator and using a coil spring as a bias spring to uniformly set a bias force applied to a rotating shaft. It is something to offer.

[0008]

According to the present invention, a cylindrical shaft portion is provided integrally with the rotating disk at a shaft center portion of the rotating disk, and a coil spring is housed in the cylindrical shaft portion. Is characterized in that it has a structure for applying a biasing force toward the axial direction. According to the structure of the present invention, the diameter of the cylindrical shaft formed on the shaft core of the rotating disk is sufficiently smaller than the diameter of the cylindrical case. Therefore,
By storing the coil spring inside the cylindrical shaft portion, the diameter of the rotating disk and the shape of the cylindrical case can be reduced. As a result, there is an advantage that the whole can be reduced in size. In addition, since a biasing force is applied to the rotating shaft by the coil spring, an advantage that variation in the biasing force between products can be reduced can be obtained.

[0009]

1 and 2 show an embodiment of a rotary pulse generator according to the present invention. FIG. 2 shows the cover 14 and the rotary shaft 17 shown in FIG. 1 removed. 1 in the figure
Reference numeral 1 denotes a cylindrical case. The cylindrical case 11 is formed of, for example, a resin material, and the connecting member 11
The cylindrical first bearings 13 are integrally formed by being connected by A. A disc-shaped insulating substrate 12 is mounted on the back side of a connecting member 11A that connects the first bearing 13 and the cylindrical case 11. A pulse generator 19 is provided on the insulating substrate 12 as shown in FIG.
Two sets are implemented as shown in FIG. The pulse generating means 19
This example shows a case where an optical switch including a light emitting element 19A and a light receiving element 19B is used.

As shown in FIG. 1, the light emitting element 19A and the light receiving element 19B are mounted on the insulating substrate 12. Light emitting element 19
A hole 13A is formed in a member opposite to the hole A.
The light is applied to the rotating disk 16 through the slit, is reflected at right angles to the reflecting surface 14A shown in FIG. 1 through the slit S formed in the rotating disk 16, and is received by the light receiving element 19B. The slits S formed in the rotating disk 16 are formed at equal intervals in the circumferential direction as shown in FIG. If the dimensions of the slit S and the non-transmissive portion are selected to be 1: 1, a pulse having a duty ratio of 1: 1 can be generated.

The two sets of pulse generating means 19 are
The position of the slit S is different from that of the slit S, and a phase difference is given to a pulse generated by the difference in the position. The direction of the phase difference has a positive and negative relationship depending on the rotation direction of the rotating disk 16, and the rotating direction of the rotating disk 16 is detected based on the phases of the two-phase pulses. The technical content of detecting the difference in the rotation direction based on the pulse generation mechanism and the phase difference is not the gist of the present invention, so that the detailed description of this portion will be omitted.

A feature of the present invention is that a cylindrical shaft portion 16A is formed on the shaft of the rotating disk 16. That is, a circular shaft portion 16 </ b> B is formed so as to protrude from the lower surface side of the rotating disk 16, and the shaft portion 16 </ b> B is supported by the first bearing 13. Further, a cylindrical shaft portion 16A is formed so as to protrude from the upper surface side of the rotating disk 16, and the cylindrical shaft portion 16A is supported by a second bearing 15 formed on the lid. Therefore, the rotating disk 16 is rotatably supported by the first bearing 13 and the second bearing 15.

A circular hole 16C is formed in the axis of the rotating disk 16, and the tip of the rotating shaft 17 is inserted into the circular hole 16C.
A key groove 16D is formed on the inner peripheral surface of the cylindrical shaft portion 16A,
The key 17 formed on the rotary shaft 17 in this key groove 16D
A (FIG. 1) is engaged. Therefore, the rotating shaft 17 is connected to the rotating disk 16 in the rotating direction, and slidably engages in the axial direction.

The rotary shaft 17 has a flange portion 17B (FIG. 1) outside the cylindrical shaft portion 16A. The flange portion 17B is held down by the lid 14 and is prevented from coming off from the lid 14. The portion of the rotary shaft 17 inserted into the cylindrical shaft portion 16A is formed thinner than the inner diameter of the cylindrical shaft portion 16A, and a step 17C is formed between the narrow portion and the thick portion. A coil spring 18 is interposed between the step 17C and the bottom surface of the cylindrical shaft portion 16A, and a biasing force of the coil spring 18 is applied to the rotating shaft 17 in a direction toward the axis of the rotating shaft 17 to project from the rotating disk 16. .

A push button switch 23 is mounted on the insulating substrate 12 so as to face the tip of the rotating shaft 17. This push button switch 2
The third push button 23A is disposed immediately below the rotation shaft 17. Therefore, when the rotating shaft 17 is pressed toward the inside of the cylindrical case 11, the rotating shaft 17 compresses and deforms the coil spring 18, and the rotating shaft 17 moves downward. By this downward movement, the push button switch 23A pushes the push button 23A, and the push button switch 23 transmits a contact signal.

On the outer periphery on the back side of the rotating disk 16, uneven portions 21 are formed at an equal pitch. As shown in FIG. 2, the concave and convex portion 21 has a concave portion 21B formed between the convex portions 21A, and the convex portions 21A and the concave portions 21B are arranged continuously in the circumferential direction of the rotating disk 16. A projection 22 formed on a member constituting the second bearing 13 is engaged with the concave / convex portion 21, and a stopping force is applied to the rotating shaft 17 each time the projection 22 engages with the concave portion of the concave / convex portion 21. Give moderation.

[0017]

As described above, according to the present invention, since the coil spring 18 is housed in the cylindrical shaft portion 16A formed on the axis of the rotating disk 16, the rotating disk 16 has the slit S There is no need for a portion for engaging the coil spring inside the portion formed with. Therefore, the shape of the rotating disk 16 can be made small.

Accordingly, the diameter of the cylindrical case 11 can be reduced, so that the overall size can be reduced. Also, despite the miniaturization, the biasing force applied to the rotating shaft 17 can be made uniform since the coil spring 18 is used, and the variation among products can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of a rotary pulse generator according to the present invention.

FIG. 2 is a plan view showing the rotary pulse generator shown in FIG. 1 with a lid and a rotary shaft removed.

[Explanation of symbols]

 Reference Signs List 11 cylindrical case 12 insulating substrate 13 first bearing 14 lid 15 second bearing 16 rotating disk 16A cylindrical shaft portion 16B shaft portion S slit 17 rotation shaft 17A key 18 coil spring 19 pulse generating means 19A light emitting element 19B light receiving element

Claims (2)

[Claims] 1. A. First Embodiment B. a cylindrical case; B. an insulating substrate for closing an opening at one end of the cylindrical case; A. a first bearing formed integrally with the cylindrical case at a position of an axis of the cylindrical case; B. a lid for closing an opening at the other end of the cylindrical case; B. a second bearing formed to protrude inside the cylindrical case at the same axial position of the lid as the cylindrical case; A shaft portion supported by the first bearing and a cylindrical shaft portion supported by the second bearing are formed so as to protrude from the back and front of the board surface, and the shaft portion and the cylindrical shaft portion are formed. A rotating disk having slits formed at equal intervals on the outer periphery thereof; H. a rotating shaft that penetrates through holes formed in the axis of the lid and that rotates the disk; A coil spring stored inside the cylindrical shaft portion for biasing the rotating shaft in a direction toward the outside of the cylindrical case; A pulse generating means for transmitting a pulse signal with the rotation of the rotating disk; At the outer peripheral side of the rotating disk, an uneven portion formed continuously on one surface of the rotating disk in the circumferential direction; A projection formed on a part of the cylindrical case to engage with the concave-convex portion to provide a moderation to the rotation of the rotary shaft. 2. The pulse generating means according to claim 1, wherein said pulse generating means comprises an optical switch comprising a light emitting element and a light receiving element.
A rotary pulse generator, wherein a slit is formed in the rotating disk at a predetermined pitch in a circumferential direction to interrupt an optical path of the optical switch.