JPH0740278Y2 - Electronic watch switch contact structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a contact structure of a switch of an electronic timepiece.

[Prior Art] A contact structure of a switch of a conventional electronic timepiece is held by inserting a rod-shaped holding member inside, as in Japanese Utility Model Publication No. 59-11378, and one end is a terminal on a circuit board. The structure is provided with a compression spring for a fixed contact that is pressed by an elastic force, and a movable contact that is provided so as to come into contact with and separate from the outer peripheral side surface of the compression spring for the fixed contact.

[Problems to be solved by the device]

However, in the above-mentioned conventional technology, since the rod-shaped holding member is inserted inside the fixed contact compression spring, there is no elastic force in the diameter direction of the spring, so that when the shock is applied from the outside or when the switch is applied with a strong force. There is a problem in that when the operation is performed, the rod-shaped holding member is broken and contact failure of the terminal occurs.

Therefore, the present invention solves such a problem,
The purpose thereof is to provide a structure which absorbs an impact from the outside, always obtains good conduction, and has good moldability and assemblability.

[Means for Solving the Problems]

A contact structure for a switch of an electronic timepiece, which includes a circuit board and a coil-shaped fixed contact compression spring, a base frame having a hole with a closed end for guiding the fixed contact compression spring, and a movable contact, The fixed contact compression spring is housed in the hole provided in the base frame, and one end of the compression spring is pressed against a terminal formed on the upper surface of the circuit board by an elastic force, and the movable contact is cut into the hole. It is characterized in that conduction is established by contacting with and separating from the outer peripheral side surface of the fixed contact compression spring exposed from the circular hole having the notch.

〔Example〕

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

FIG. 1 is a plan view of a switch structure of a timepiece, in which 1 is a base frame of the timepiece, 2 is a compression spring for a fixed contact, and 3 is a compression spring for a fixed contact.
Is a switch lever, 4 is a circuit board, 5 is a winding stem, and 7 is a winding stem guide plate. The base frame 1 has a hole 1a for guiding the fixed contact compression spring 2 and a wall 1b for holding the fixed contact compression spring 2.
The rotation center 1c of the switch lever 3 is provided, and the switch lever 3 is integrally formed with a movable contact 3a that comes in contact with and separates from the fixed contact compression spring 2, a winding stem pressing portion 3b, and a return spring portion 3c. . Further, the fixed contact compression spring 2 is provided on the circuit board 4.
The terminal 4a is patterned on the side.

In FIG. 1, when the winding stem 5 is in the normal position, the winding stem pushing portion 3b of the switch lever 3 is pushed toward the center of the movement by the tip of the winding stem 5, and the switch lever 3 is moved to the base frame 1c. The rotation of the return spring portion 3c is clockwise with respect to, and the return spring portion 3c has an elastic force. At this time, the movable contact 3a comes into contact with the fixed contact compression spring 2 to establish conduction. Next, when the winding stem 5 is in the first stage, the elastic force of the return spring portion 3c of the switch lever 3 causes the switch lever to rotate counterclockwise as indicated by the one-dot chain line in FIG. Is separated from the fixed contact compression spring 2 and conduction cannot be obtained.

FIG. 2 is a sectional view taken along the line II of FIG. A hole 1a for guiding one end of the fixed contact compression spring 2 is formed in the base frame 1, and a circular shape having a notch portion for holding the outer peripheral portion of the fixed contact compression spring 2 following the hole 1a. A wall 1b of the hole is formed. The width of the cutout portion of the wall 1b of the circular hole is set to be smaller than the outer diameter of the fixed contact compression spring 2, and the fixed contact compression spring 2 is held so as not to go out of the cutout portion.
The circular hole opens at the end of the wall 1b and is closed on the hole 1a side. The length from the opening end of the circular hole to the closed end of the hole 1a is larger than the natural length of the fixed contact compression spring 2. It is also set to be short. Reference numeral 4 denotes a circuit board on which terminals 4a are printed and formed on the opening side of the circular hole, and is held by a holding plate 6 so as to be joined to the base frame 1. The fixed contact compression spring 2 is inserted from the opening side of the circular hole, guided by the hole 1a of the base frame 1, and held by the wall 1b of the circular hole having a notch. The fixed contact compression spring 2 has a natural length larger than the length from the opening end of the circular hole to the closed end of the hole 1a, and is between the terminal 4a of the circuit board 4 and the closed end of the base frame hole 1a. Is held in a compressed state with
It is in contact with the terminal 4a by the elastic force. However, since the fixing terminal does not need to be soldered to the board, the connection is always kept good, and the fixed contact compression spring 2 is guided and held by the hole, so that the fixed contact compression spring 2 can be positioned. It can be made simple, and since the holding member is the wall of the base frame, it has sufficient strength against external impact.

Reference numeral 3a denotes a movable contact, which comes into contact with or separates from the outer peripheral side surface of the fixed contact compression spring 2 exposed from the circular hole cutout portion of the base frame 1 by the configuration described in FIG. Therefore, when the movable contact 3a comes into contact with the fixed contact compression spring 2, the fixed contact compression spring 2 is deformed in the diametrical direction because it is held on the outer periphery, absorbs the impact of the contact, and always achieves good conduction. Is obtained. The lever switch structure has been described above as an embodiment of the present invention, but the push button switch structure can also be implemented in the same manner.

[Effect of device]

As described above, the present invention uses a compression spring for a fixed contact, accommodates the compression spring in a hole of a base frame having a closed end, and press-contacts with a terminal of a circuit board. Since the movable contact is brought into contact with and separated from the part, good conductivity can be obtained without soldering the fixed contact to the circuit board, and at the same time, the fixed contact compression spring can be installed by simply dropping it into the hole of the base frame. Very easy to embed,
Easy to position. Further, since the shape of the portion of the base frame for holding the fixed contact compression spring is simple, its moldability is improved and the die structure is also simplified. Further, the compression spring for fixed contacts has a coil shape, and since it has elastic force in the diameter direction thereof by being guided by the hole of the base frame, it has a great effect such as absorbing the contact impact of the movable contact.

[Brief description of drawings]

FIG. 1 is a plan view of a switch structure of a timepiece according to the present invention, and FIG. 2 is a sectional view of a contact structure of the switch of FIG. 1 ... Base frame 2 ... Fixed contact compression spring 3 ... Switch lever 4 ... Circuit board 5 ... Winding stem 6 ... Presser plate

Claims (1)

[Scope of utility model registration request] 1. A switch for an electronic timepiece comprising a movable contact and a circuit board, a coil-shaped compression spring for fixed contacts, a base frame having a hole having a closed end for guiding the compression spring for fixed contacts, and a movable contact. In the contact structure, the fixed contact compression spring is housed in the hole provided in the base frame, and one end thereof is pressed into contact with a terminal formed on the upper surface of the circuit board by an elastic force, so that the movable contact is A contact structure for a switch of an electronic timepiece, characterized in that the contact spring is brought into contact with and separated from an outer peripheral side surface of the compression spring for a fixed contact exposed from a circular hole having a cutout portion of the hole to conduct electricity.