# US 8,540,403 B2 · Illumination device, electronic apparatus including the same, and method of manufacturing illumination device

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- Number: US 8,540,403 B2
- Document ID: US8540403B2
- Status: Granted
- Kind: B2
- Application number: 12/882,471
- Filed: 2010-09-15
- Published: 2011-09-15
- Granted: 2013-09-24
- Earliest claimed: 2009-09-16
- Assignees: Fujitsu Limited
- Applicants: Takeshi Komuro; Manabu Hongo; Wataru Murata
- Inventors: Takeshi Komuro; Manabu Hongo; Wataru Murata
- Web page: https://patentgrep.com/patent/US8540403B2

## CPC

- H04M 1/22: Illumination; Arrangements for improving the visibility of characters on dials
- H04M 1/18: Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment (H04M1/19 takes precedence)
- Y10T 29/49993: Filling of opening
- H04M: TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An illumination device is provided including a light emitter; and a panel. The panel includes a recess configured to accept an optically transparent sealant that is illuminated by light from the light emitter. Moreover, the panel includes a hole in the recess that is sealed by the optically transparent sealant.

## Claims

### Claim 1

An illumination device comprising:
a light emitter; and
a panel including
a recess configured to accept an optically transparent sealant to be illuminated by light from the light emitter, the recess provided on a first surface of the panel, the first surface facing the emitter, and
a hole provided in the recess and sealed by the sealant, the hole penetrating from the first surface to a second surface of the panel, the second surface being opposite the first surface.

### Claim 2 (depends on 1)

The illumination device according to claim 1, wherein the sealant fills the hole.

### Claim 3 (depends on 1)

The illumination device according to claim 1, wherein the panel and the sealant have different optical transparencies.

### Claim 4 (depends on 1)

The illumination device according to claim 1, wherein the panel is a portion of a casing that houses the light emitter.

### Claim 5 (depends on 4)

The illumination device according to claim 4, wherein the sealant provides a water-tight seal preventing water from entering the casing via the hole.

### Claim 6 (depends on 1)

The illumination device according to claim 1, wherein the panel includes a plurality of holes in the recess.

### Claim 7 (depends on 1)

The illumination device according to claim 1, wherein the panel includes a plurality of recesses and a plurality of holes in each of the recesses.

### Claim 8 (depends on 1)

The illumination device according to claim 1, wherein a thickness of the panel in the recess is thinner than a thickness of the panel in a region other than the recess.

### Claim 9 (depends on 8)

The illumination device according to claim 8, wherein the sealant is provided within the hole such that a thickness of the optically transparent sealant does not exceed a thickness of the panel in a region other than the recess.

### Claim 10 (depends on 1)

The illumination device according to claim 1, wherein the size of the hole is set based on at least one of viscosity and surface tension of the sealant.

### Claim 11

An electronic apparatus comprising:
an illumination device including,
a light emitter; and
a panel, the panel including,
a recess configured to accept an optically transparent sealant to be illuminated by light from the light emitter, the recess provided on a first surface of the panel, the first surface facing the emitter, and
a hole provided in the recess and sealed by the sealant, the hole penetrating from the first surface to a second surface of the panel, the second surface being opposite the first surface.

### Claim 12

A method of manufacturing an illumination device, comprising:
providing a recess on a first surface of a panel;
providing a hole in the recess, the hole penetrating from the first surface to a second surface of the panel;
sealing the hole by filling the recess with an optically transparent sealant; and
positioning the panel to receive light in the recess that is illuminated from a light emitter, wherein
the first surface of the panel faces the light emitter.

### Claim 13 (depends on 12)

The method of manufacturing an illumination device according to claim 12, wherein the resin is impeded from flowing out of the hole while the resin is being received within the recess and cured.

### Claim 14 (depends on 12)

The method of manufacturing according to claim 12, wherein the size of the hole is set based on at least one of viscosity and surface tension of the resin.