JP2003059329A - Lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system not requiring a troublesome production process. SOLUTION: This lighting system has a ring lens 2 into which ring light flux 1, etc., emitted downward is led, capable of refracting the light flux 1, etc., toward the ring center. More specifically, the lighting system has a horizontal and ring board 3; light emitting diode groups 4 disposed on the lower face of the board 3 just downward in a ring state; and the Fresnel lens 2 disposed below the light emitting diode groups 4, capable of refracting the light flux 1, etc., from the light emitting diode groups 4 toward the ring center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device which is preferably used for product inspection.

[0002]

2. Description of the Related Art An illuminating device of this type has a ring shape, is fitted and fixed to the outer periphery of a cylindrical portion of a CCD camera arranged downward, and illuminates an article to be inspected placed below. The article to be inspected is photographed and inspected by the camera. As such an illuminating device, in order to irradiate the article to be inspected efficiently, the luminous flux of the illuminating device is often applied toward the ring center direction. For this reason, a flexible substrate in which a group of light emitting diodes is mounted and a part of the ring shape is cut into an irregular shape is wound and manufactured so that the substrate surface is oriented obliquely toward the center.

[0003]

However, after mounting the light emitting diode group on the flexible substrate, a complicated manufacturing process of winding the light emitting diode group in a ring shape so that the substrate surface is directed obliquely to the center is required. The present invention aims to provide a lighting device that does not require such a troublesome manufacturing process.

[0004]

DISCLOSURE OF THE INVENTION The present invention is an illuminating device provided with a ring-shaped lens into which a downwardly radiated ring-shaped light beam is introduced and which can be refracted toward the center of the ring. . Further, it is preferable that the lens can be adjusted in the vertical direction. Further, in detail, a horizontal and ring-shaped substrate, a group of light-emitting diodes arranged directly below and in the shape of a ring on the lower surface of the substrate, and a luminous flux from the light-emitting diode group arranged on the lower surface of the light-emitting diode group. Is an illuminating device including a lens capable of refracting toward the center of the ring. It is preferable that the substrate is housed in a ring-shaped case having an opening on the lower surface, an adjustment ring is screwed onto the outer circumference of the case, and a lens is fixed to the inner circumference of the adjustment ring. Furthermore, the present invention also provides a horizontal and ring-shaped light guide plate, a group of light-emitting diodes arranged in a ring shape on the outer periphery of the light guide plate to introduce light into the light guide plate, and arranged on the lower surface of the light guide plate. An illumination device may be provided with a lens that is capable of refracting a light beam that is guided from the light guide plate toward the center of the ring.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described, but it is merely an exemplary embodiment adopted based on the present invention, and the present invention is based on matters peculiar to the embodiment. However, the technical scope of the present invention should be determined based on the matters shown in the claims and the matters substantially equivalent to the matters.

In the embodiment shown in FIG. 1, a ring-shaped Fresnel lens is suitable in which a downwardly radiating ring-shaped light beam 1 ... Is introduced and the light beam 1 ... Can be refracted toward the ring center direction. 2 is a lighting device. More specifically, a horizontal and ring-shaped substrate 3, a light emitting diode group 4 arranged in a ring shape directly below on the lower surface of the substrate 3, and a lower surface of the light emitting diode group 4 are arranged. 4 is a illuminating device including a lens 2 capable of refracting light beams 1 ...

Further, the substrate 3 is housed in a ring-shaped case 5 having an opening on the lower surface, and the substrate 3 is held by the case 5 by a holding means (not shown). An adjusting ring 6 is screwed onto the outer circumference of the case 5 and attached to the case 5, and the lens 2 is fixed to the inner circumference of the adjusting ring 6. Therefore, by rotating the adjusting ring 6 with a hand or the like, the lens 2 can be finely adjusted in the up-down direction together with the adjusting ring 6, and thereby the focusing direction of the light fluxes 1 can be finely adjusted. The light emitting diode group 4 may be a chip type light emitting diode group. The illumination device is attached to the outer periphery of the tubular portion 7 of the camera by appropriate means.

Next, in the embodiment shown in FIG. 2, a horizontal and ring-shaped light guide plate 11 and a group of light-emitting diodes 12 arranged in a ring shape on the outer periphery of the light guide plate 11 to introduce light into the light guide plate 11. The illumination device includes a lens 14 disposed on the lower surface of the light guide plate 11 and capable of refracting the light flux 13 that is guided from the light guide plate 11 toward the center of the ring. Of course, the present embodiment is not limited to the illumination device including the ring-shaped lens 14 into which the downwardly radiated ring-shaped light beam 13 is introduced and which is capable of refracting the light beam 13 toward the center of the ring. Absent. As is well known, the upper surface of the light guide plate 11 is provided with fine irregularities (not shown),
A white ring-shaped reflection sheet 15 is arranged on the upper surface of the light guide plate 11.

According to the present embodiment, the substrate 3 may be flat in FIG. 1 and the light guide plate 11 may be flat in FIG. 2, and both of them can be manufactured without complicated manufacturing steps. Note that FIG.
Then, although a ring-shaped flexible substrate is required as the substrate of the light emitting diode group 12, it is not required to be arranged in a slanting posture and not in a deformed shape, which is advantageous in manufacturing compared with the related art.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the present invention.

[Explanation of symbols]

1 luminous flux 2 lens 3 substrates 4 Light emitting diode group 5 cases 6 adjustment ring 11 Light guide plate 12 Light emitting diode group 13 luminous flux 14 lenses

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) G01N 21/84 F21Y 101: 02 // F21Y 101: 02 F21S 1/02 G

Claims (5)

[Claims] 1. An illumination device provided with a ring-shaped lens into which a downwardly radiated ring-shaped light beam is introduced and which is capable of refracting the light beam toward the center of the ring. 2. The illumination device according to claim 1, wherein the lens is adjustable in the vertical direction. 3. A horizontal and ring-shaped substrate, a group of light-emitting diodes arranged directly below and in a ring shape on the lower surface of the substrate, and a light-emitting diode group arranged on the lower surface of the light-emitting diode group, An illumination device including a lens capable of refracting toward the center of the ring. 4. The illumination according to claim 3, wherein the substrate is housed in a ring-shaped case having a lower surface opening, an adjustment ring is screwed onto the outer circumference of the case, and a lens is fixed to the inner circumference of the adjustment ring. apparatus. 5. A horizontal and ring-shaped light guide plate, a group of light-emitting diodes arranged in a ring shape on the outer periphery of the light guide plate to introduce light into the light guide plate, and a light guide plate arranged on the lower surface of the light guide plate. An illuminating device including a lens capable of refracting a light flux derived from an optical plate toward the center of the ring.