Photography light source device

• US 20040196643A1
• Filed: 09/16/2003
• Published: 10/07/2004
• Est. Priority Date: 04/04/2003
• Status: Active Grant

• Current Assignee: Stanley Electric Company Limited
• Original Assignee: Stanley Electric Company Limited
• Inventors: Terada, Toshiyuki, Kato, Shigekazu, Sekido, Keizo, Iritono, Kimihiro
• Granted Patent: US 7,052,151 B2
• Time in Patent Office: Days
• US Class Current: 362/3
• CPC Class Codes: G03B 15/02 Illuminating scene
• CPC Class Codes: H01L 2224/0401 Bonding areas specifically adapted for bump connectors, e.g. under bump metallisation [UBM]
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details

Abstract

Light source devices for photography using LED elements as a light source known in the prior art provide insufficient quantity of light, and the inability to avoid size increases in order to generate a sufficient quantity of light has been problematic. A photography light source device 1 according to the present invention has a light source comprising a plurality of LED elements 2 generating white light or light of the three primaries and arranged in one or more rows parallel with the direction of the longer side of the photograph, a case 3 having a lens on which linear fresnel cuts 3a have been applied in a linear direction parallel to the arrangement direction is mounted on the LED element 2, and upon lighting of the LED element 2, drive is performed with a current of between 3 and 50 times the magnitude of the rated current thereof and a lighting duration of between 10 and 600 msec. Accordingly, the linear fresnel cuts 3a increase the efficiency of illumination by distributing light uniformly over the area of exposure, and in addition, a large current is applied in a pulse type pattern as the drive current, thus solving the problems by allowing sufficient brightness to be achieved with no associated increases in size.

Claims

1. A photography light source device provided as a light source of a camera included in a mobile device, comprising a light source of said photography light source device composed of a plurality of LED elements generating white light or light of the three primaries and arranged in a row parallel with the longitudinal direction of the photograph, and a case having a lens on which linear fresnel cuts are applied in a linear direction parallel to said arrangement direction mounted on said LED element;

characterized in that upon lighting of said LED element, a drive is performed with a current of between 3 and 50 times of a standard of said LED element and a lighting duration of between 10 and 600 msec.

2. The photography light source device of claim 1, further characterized in that:

said light source includes a white-light LED element having a combination of an LED element generating blue light and fluorophor generating yellow-light or a combination of an LED element generating near-ultraviolet light and fluorophor generating the three primaries, and when said white-light LED element is realized using an LED element generating blue light and fluorophor generating yellow light, one or more LED elements generating red light is included in said light source.

3. The photography light source device of claim 1 or 2, further characterized in that:

electrical contact between said case and said mobile device is realized using a spring contact piece.

4. The photography light source device of claim 1, further characterized in that:

said light source is realized using LED elements generating the three primaries and arranged in a matrix arrangement having a number of rows and a number of columns equal to at least the number of primary colors.

5. The photography light source device of claim 1, further characterized in that:

said light source is realized using LED elements generating the three primaries and arranged in a stacked arrangement of said LED element facing in the direction of the illumination axis of said photography light source device.