Light source device for endoscope and assembly method for light source unit

• US 6,918,693 B2
• Filed: 02/19/2003
• Issued: 07/19/2005
• Est. Priority Date: 02/20/2002
• Status: Expired due to Fees

• Current Assignee: Pentax Corporation (Hoya Corporation)
• Original Assignee: Pentax Corporation (Hoya Corporation)
• Inventors: Sato, Takashi, Ota, Noriko
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Sawhney, Hargobind S.
• Application Number:
  US10/367,774
• Publication Number:
  US 20030156430A1
• Time in Patent Office: 881 Days
• Field of Search: 362/551, 362/554, 362/555, 362/800, 362/574, 362/572, 362/227, 362/235, 362/236, 362/238, 362/241, 362/320, 362/346
• US Class Current: 362/574
• CPC Class Codes: A61B 1/0669 at proximal end of an endoscope
• CPC Class Codes: A61B 1/0684 using light emitting diodes [LED]
• CPC Class Codes: A61B 1/07 using light-conductive means, e.g. optical fibres
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence

Abstract

A light source device for an endoscope is provided. The light source device comprises a light source unit that supplies illumination light to an incident end face of a light guide member, which is laid inside an endoscope. The light source unit comprises a plurality of reflecting board members. Each reflecting board member has at least one light emitting diode. The plurality of reflecting board members are assembled into a concaved open polyhedron, so that the light emitted from the light emitting diodes are concentrated onto the incident end face of the light guide member.

Claims

1. A light source device for an endoscope, comprising:

a light source unit that supplies illumination light to an incident end face of a light guide member inside an endoscope, said light source unit is an assembly of a plurality of reflecting board members that have a light reflecting side, and each of said plurality of reflecting board members include a single bullet-shaped light emitting diode, the light emitted from said light emitting diodes is concentrated onto the incident end face of the light guide member, and

wherein said assembly is arranged to form a concave open polyhedron shape.

2. The light source device according to claim 1, wherein said plurality of reflecting board members comprise a synthetic resin which has a reflecting layer on one side.

3. The light source device according to claim 2, wherein said reflecting layer comprises a plating.

4. The light source device according to claim 2, wherein said reflecting layer is not formed on an area where lead wires of each said light emitting diode penetrate said reflecting board member, so that a short circuit between said lead wires is prevented.

5. The light source device according to claim 1, further comprising a flexible printed circuit attached on each reflecting board member of said plurality of reflecting board members on a side opposite to said light reflecting side, to supply electrical power to each said light emitting diode.

6. A method for fabricating a light source unit comprising:

cutting a board member, of a synthetic resin, into a shape to form a concave open polyhedron shape;

forming a reflecting layer on one side of the board member;

mounting a plurality of light emitting diodes onto the board member on which the reflecting layer is formed;

assembling the board member into the concave open polyhedron shape; and

wiring the light emitting diodes on a side of the board member which is opposite to the reflecting layer.

7. A light source device that supplies illumination light to an incident end face of a light guide member of an endoscope, the device comprising:

a plurality of trapezoid-shaped reflecting board members that have a light reflecting side, and each of said plurality of reflecting board members includes at least one light emitting diode, the light emitted from said light emitting diodes is concentrated onto the incident end face of the light guide member, and

wherein said plurality of trapezoid-shaped reflecting board members are configured to form a bowl shape.

8. The light source device according to claim 7, wherein said plurality of reflecting board members include a synthetic resin which has a reflecting layer on one side.

9. The light source device according to claim 8, wherein said reflecting layer comprises a plating.

10. The light source device according to claim 8, wherein said reflecting layer is not formed on an area where lead wires of said at least one light emitting diode penetrate a respective reflecting board member, so that a short circuit between said lead wires is prevented.

11. The light source device according to claim 7, further comprising a flexible printed circuit which is attached on each reflecting board member of said plurality of reflecting board members on a side opposite to said light reflecting side, to supply electrical power to said at least one light emitting diode.

12. A light source device that supplies illumination light to an incident end face of a light guide member inside an endoscope, the device comprising:

a plurality of trapezoid-shaped reflecting board members that have a light reflecting side, each of said plurality of reflecting board members includes at least one light emitting diode, the light emitted from said light emitting diodes being concentrated onto the incident end face of the light guide member; and

a center reflecting board member,

wherein said plurality of trapezoid-shaped reflecting board members are attached to the center reflecting board member to form a polyhedron shape.

13. The light source device according to claim 12, wherein said plurality of reflecting board members and said center reflecting board member include a synthetic resin which has a reflecting layer on one side.

14. The light source device according to claim 13, wherein said reflecting layer comprises a plating.

15. The light source device according to claim 13, wherein said reflecting layer is not formed on an area where lead wires of said at least one light emitting diode penetrate a respective reflecting board member, so that a short circuit between said lead wires is prevented.

16. The light source device according to claim 12, further comprising a flexible printed circuit which is attached on each reflecting board member of said plurality of reflecting board members and said center reflecting board member on a side opposite to said light reflecting side, to supply electrical power to said at least one light emitting diode.