JPS6128411Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dial display device used in radio receivers and the like.

In a radio receiver, when the rotary knob for tuning is operated, the capacitance of the variable capacitor changes and becomes tuned to a predetermined frequency, and this tuned frequency is displayed on the dial display section. ing. The simplest dial display device is a circular dial display device in which the tuning knob is formed on a disk, a pointer is provided on one side of the disk and the cabinet, and a scale plate is provided on the other side. This device is used in inexpensive radio receivers, etc., but if the diameter of the knob is small, the accuracy of the display is poor, and it is not desirable in terms of design.

Therefore, a transverse dial display device in which the pointer of the dial display section, the tuning knob, and the variable capacitor are connected by a dial thread is widely used. However, this method requires a large number of parts, and requires assembly work.
In particular, the work of tensioning the dial thread is troublesome and occupies a relatively large amount of space. Therefore, there is a problem that it cannot be used in small and inexpensive radio receivers.

The present invention was developed in view of these problems, and includes a cabinet in which a dial scale plate is provided and a rotary knob is rotatably provided, and a pinion that rotates in conjunction with the rotation of the rotary knob. a rack that meshes with the pinion and is provided with a pointer and a guided section; and a rack that is provided in the cabinet and guides the guided section so that the pointer moves linearly along the dial scale plate. The present invention relates to a dial display device each including a guide member for guiding the dial. Therefore, it is possible to provide a linear dial display device that is easy to assemble and is compact in terms of space.

An embodiment of the present invention will be described below with reference to the drawings.
In this embodiment, the present invention is applied to a pocketable radio receiver exclusively for AM. As shown in FIG. 1, this radio receiver has a substantially flat rectangular parallelepiped-shaped cabinet 1. A horizontally long slit-shaped opening 2 is formed in the upper surface of the cabinet 1, and a part of the outer circumferential surface of the disc-shaped tuning rotary knob 3 is removed from the cabinet 1 by this opening 2. Exposed to the outside. A large number of grooves extending in the axial direction of the knob 3 are formed on the outer peripheral surface of the knob 3, so that the knob 3 does not slip when operating the knob 3 with a finger. Further, a horizontally long window 4 is formed at the upper part of the front surface of the cabinet 1, and this window 4 is covered with a transparent plate 5. This window 4 constitutes a dial display section, and a dial scale plate 6 is disposed inside the transparent plate 5.

The rotary knob 3 for tuning is fixed to the operating shaft 8 of the variable capacitor 7, as shown in FIG. Further, the variable capacitor 7 is attached to a printed circuit board 9 disposed within the cabinet 1. A pinion 10 is integrally connected to the front end surface of the tuning rotary knob 3. A rack 11 is disposed on the back side of the dial scale plate 6 in correspondence with the pinion 10, and meshes with the pinion 10. As shown in FIGS. 3 and 4, this rack 11 is integrally formed with a guided portion 13 via a connecting piece 12, and a groove 14 of this guided portion 13 engages with a guide rail 15. Together, the rack 11 is supported so as to be slidable in the left and right directions in FIG. In other words, this guide rail 15 serves as a guide member that guides the guided portion 13. Note that the rail 15 is integrally connected to the cabinet 1. A dial pointer 16 is engraved on the front surface of the connecting piece 12 of the rack 11. A horizontally long slit-shaped opening 17 is formed in the dial scale plate 6 in correspondence with the dial pointer 16, so that the pointer 16 can be seen from the front.

Therefore, when the rotary knob 3 for tuning, which is exposed to the outside through the opening 2, is rotated with a finger,
The operating shaft 8 of the variable capacitor 7 to which this knob 3 is directly connected rotates, and the capacitance of the variable capacitor 7 changes to tune to the broadcast frequency of a desired broadcast station.
At the same time, the rotation of the rotary knob 3 for tuning is as follows.
A pinion 1 that is integrally connected to this knob 3
0 to the rack 11, and the rack 11 is guided by the rail 15 and moves to the left or right in FIG. Therefore, the dial pointer 16 formed on the connecting piece 12 of the rack 11 indicates the tuning frequency on the dial scale plate 6, and thereby the frequency of the broadcast being received can be known.

As described above, this radio has a relatively small number of parts and does not use any dial strings, making assembly work very easy.Furthermore, as is clear from the drawings, the space required for the dial display device is also small. This makes it fully applicable to small radio receivers.

Next, a modification of the above embodiment will be explained with reference to FIGS. 5 and 6. Note that parts corresponding to those in the above embodiment are given the same reference numerals, and descriptions of parts having the same structure will be omitted. In this modification, the rack 11 and the guided portion 13 are connected at both ends by a pair of thin, elastically deformable connecting pieces 18, and are integrally formed. Then, a protruding piece 19 is formed on the front side of the rack 11,
A pointer 16 is formed on this connecting piece 18. Therefore, as particularly shown in FIG.
is elastically deformed, and the engagement between the rack 11 and the pinion 10 is released. Therefore, the rack 11 can be freely moved by hand in the length direction of the rail 15, and the pointer 16 can be correctly positioned. That is, the position of the dial pointer 16 can be adjusted after assembly.

As described above, the present invention uses a combination of a rack and a pinion to convert the rotational motion of the rotary knob for tuning into linear motion, thereby moving the pointer in a straight line and displaying a transverse dial. Since the device is configured as a device, it is possible to provide a transverse type dial display device that has a small number of parts, is easy to assemble, and is compact in terms of space.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a pocket double radio receiver, in which Fig. 1 is an external perspective view of this radio receiver, Fig. 2 is a sectional view taken along the line ~ in Fig. 1, Fig. 3 is a sectional view taken along line ~ in Fig. 2, Fig. 4 is an exploded perspective view of the main parts, Fig. 5 is a perspective view of the main parts of a modification of the above embodiment, and Fig. 6 is a front view of the main parts. be. In addition, in the symbols used in the drawings, 3... rotary knob for tuning, 6... dial scale plate,
10... Pinion, 11... Rack, 13... Guided portion, 15... Guide rail, 16... Dial pointer.

Claims (1)

[Scope of utility model registration request] A cabinet provided with a dial scale plate and rotatably provided with a rotary knob, a pinion that rotates in conjunction with the rotation of the rotary knob, and a pointer and a guided portion that mesh with the pinion. A dial display device comprising: a rack; and a guide member provided in the cabinet to guide the guided portion so that the pointer moves linearly along the dial scale plate.