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Switch and keyboard provided therewith

A switch and light guide technology, applied in the field of switches, can solve the problems of brightness deviation, failure to obtain brightness uniformity, narrow brightness uniformity, etc., achieve small brightness deviation, improve brightness uniformity, and good brightness uniformity Effect

Inactive Publication Date: 2015-02-11
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there is a problem that the luminance of the light passing through the light guide 7 varies, so that a switch with good luminance uniformity cannot be obtained.
[0007] On the other hand, in the switch device of Patent Document 2, when the cross-sectional area of ​​the lens 20 is limited due to the relationship with the occupied area of ​​the contact mechanism, etc., there is a problem that the area with good brightness uniformity is narrow.

Method used

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  • Switch and keyboard provided therewith
  • Switch and keyboard provided therewith
  • Switch and keyboard provided therewith

Examples

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Embodiment 1

[0122] Such as Figure 14 As shown, a cylindrical light guide body 50 with a diameter of 3.2 mm and a length of 7.5 mm is arranged directly above the light source 11 at a distance of 0.2 mm, and the analysis reaches a 10 cm square with a distance of 9 mm from the exit surface of the light guide body 50. There is a correlation between the amount of light on the light receiving surface 90 of the key top and the inclination angle of the concave lens 52 . The microlens array structure formed on the exit surface was formed by arranging microlenses with a diameter of 0.4 mm and an inclination angle of 30 degrees in a honeycomb structure. Figure 15 The graph of the graph shows the analysis results.

[0123] Such as Figure 15 It can be seen that in order to exceed the desired luminance efficiency of 60%, the inclination angle of the concave lens 52 needs to be at least 55 degrees or less, and to exceed the more preferable luminance efficiency of 80%, the inclination angle of the c...

Embodiment 2

[0125] The angle of inclination for the concave lens on the incident surface is 20 degrees, and a microlens with a diameter of 0.4 mm is adjacently configured as a cylindrical light guide with a honeycomb structure on the outgoing surface, which is the same as that of the first embodiment in other respects conditions, and analyze the luminance distribution on the light-receiving surface of the key top. Figure 16 The distribution graph of (A) shows the analysis results.

Embodiment 3

[0127] Regarding the 3.2 mm square rectangular columnar light guide, the luminance distribution was analyzed under the same conditions as in Example 2 above in other respects. Figure 16 The distribution graph of (B) shows the analysis results.

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Abstract

There is provided a switch having a wide, uniform luminance region. In the switch, light emitted from a light source is output through an outgoing surface located in an upper end surface of a light guide 50, the light being incident from an incident surface located in a lower end surface of the light guide 50 arranged above the light source. A concave lens 52 is formed in the incident surface of the light guide 50, and a microlens array is formed in the outgoing surface of the light guide 50.

Description

technical field [0001] The present invention relates to switches, and more particularly to illuminated keypad switches having a light source mounted on the surface of a substrate. Background technique [0002] Conventionally, as a light-emitting switch, for example, there is a rubber switch in which a light-transmitting light guide 7 is arranged directly above LED 3 mounted on the surface of a substrate (see Patent Document 1). [0003] Moreover, for example, there is a switch device in which a colorless and transparent lens 20 is arranged directly above LED 60 mounted on the surface of a substrate (see Patent Document 2). In addition, the lower surface of the lens 20 is processed into a concave surface, and the upper surface of the lens 20 is processed into a convex surface processed by surface texturing to suppress brightness unevenness. [0004] Patent Document 1: JP-A-2006-302555 [0005] Patent Document 2: JP-A-2009-123662 [0006] However, in the rubber switch of pa...

Claims

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Application Information

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IPC IPC(8): H01H13/02H01H13/14H01H13/83
CPCH01H9/161H01H2219/066H01H13/023H01H13/83
Inventor 田上靖宏仲真美子井泽一平筱原正幸
Owner ORMON CORP