LIGHT EMITTING DEVICE AND IMAGE SURVEILLANCE APPARATUS THEREOF

• US 20170146222A1
• Filed: 11/04/2016
• Published: 05/25/2017
• Est. Priority Date: 11/19/2015
• Status: Active Grant

• Current Assignee: Vivotek, Inc.
• Original Assignee: Vivotek, Inc.
• Inventors: Hsu, Hsiang-Lin, Lai, Ping-Yu, Yeh, Yi-Hsin
• Granted Patent: US 10,203,094 B2
• Time in Patent Office: Days
• CPC Class Codes: F21V 17/02 with provision for adjustment F21V17/04 - F21V17/08 take precedence
• CPC Class Codes: F21V 5/007 Array of lenses or refractors for a cluster of light sources, e.g. for arrangement of multiple light sources in one plane combination of two or more refractors F21V5/008
• CPC Class Codes: G08B 13/19619 Details of casing
• CPC Class Codes: G08B 13/19626 optical details, e.g. lenses, mirrors or multiple lenses
• CPC Class Codes: H04N 23/51 Housings
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/56 provided with illuminating means
• CPC Class Codes: H04N 7/183 for receiving images from a single remote source

Abstract

A light emitting device includes a casing, a lighting module, and a lens module. The lighting module is disposed in the casing for providing light and includes first and second light sources. The lens module faces the lighting module and includes a first lens aligned with the first light source, a second lens aligned with the second light source, a sliding frame, and a driving motor. The sliding frame is fixed to the first lens and has a thread portion. The driving motor has a screw rod for engaging with the thread portion, to make the sliding frame movable along the screw rod. The driving motor rotates the screw rod to make the thread portion drive the first and second lenses close to or away from the first and second light sources. Accordingly, the present invention reduces the manufacturing cost of the light emitting device and simplifies its mechanical design.

Claims

1. A light emitting device comprising:

a casing;

a lighting module disposed in the casing for providing light, the lighting module comprising;

a first light source; and

a second light source adjacent to the first light source; and

at least one lens module movably facing the lighting module, the at least one lens module comprising;

a first lens aligned with the first light source;

a second lens extending from the first lens, the second lens being aligned with the second light source;

a sliding frame fixed to the first lens, the sliding frame having a thread portion; and

a driving motor having a screw rod, the screw rod being engaged with the thread portion to make the sliding frame movable along the screw rod, the driving motor being used to provide a driving force for making the thread portion drive the first lens and the second lens close to or away from the first light source and the second light source in parallel via the sliding frame with rotation of the screw rod.

2. The light emitting device of claim 1, wherein the sliding frame further has a main base, the thread portion has a shaft base, a torsion spring, and an elastic clamping claw, the shaft base is pivoted to the main base and has a first thread facing the screw rod, the elastic clamping claw is connected to the shaft base and has a second thread facing the screw rod, and the torsion spring is connected to the shaft base and the elastic clamping claw for providing an elastic force to drive the shaft base and the elastic clamping claw to cooperatively clamp the screw rod, so as to make the first thread and the second thread engaged with the screw rod respectively.

3. The light emitting device of claim 2, wherein the shaft base has at least one guiding claw adjacent to the elastic clamping claw, and the at least one guiding claw abuts against the screw rod to assist the shaft base and the elastic clamping claw to move along the screw rod in an undeflected manner.

4. The light emitting device of claim 1, wherein the first lens has a first curvature, the second lens has a second curvature, and the first curvature is different from the second curvature.

5. The light emitting device of claim 1 further comprising:

a first guiding rod fixed to the casing, the first guiding rod passing through the sliding frame for guiding the first lens to move along the first guiding rod via the sliding frame.

6. The light emitting device of claim 5 further comprising:

a second guiding rod fixed to the casing and diagonal to the first guiding rod, the second guiding passing through the second lens for guiding the second lens to move along the second guiding rod.

7. The light emitting device of claim 5, wherein the sliding frame has at least one sleeve portion formed at a position where the first guiding rod passes through the sliding frame, and the at least one sleeve portion sleeves the first guiding rod to make the sliding frame move along the first guiding rod in an undeflected manner.

8. The light emitting device of claim 1, wherein a maximum travelling distance of the first lens and second lenses relative to the first light source and the second light source is equal to a focal distance of one of the first lens and the second lens.

9. The light emitting device of claim 1, wherein the at least one lens module further comprises:

a first condensing lens disposed between the first light source and the first lens for condensing light provided by the first light source; and

a second condensing lens disposed between the second light source and the second lens for condensing light provided by the second light source.

10. The light emitting device of claim 1, wherein the lighting module further comprises a control circuit board and a heat conduction sheet, the first light source and the second light source are disposed on the control circuit board, and the heat conduction sheet is attached to the control circuit board for dissipating heat energy generated by the lighting module when the lighting module is operated.

11. An image surveillance apparatus comprising:

a housing;

an image capturing device disposed in the housing for capturing images; and

a light emitting device disposed in the housing, the light emitting device comprising;

a casing;

a lighting module disposed in the casing for providing light, the lighting module comprising;

a first light source; and

a second light source adjacent to the first light source; and

at least one lens module movably facing the lighting module, the at least one lens module comprising;

a first lens aligned with the first light source;

a second lens extending from the first lens, the second lens being aligned with the second light source;

a sliding frame fixed to the first lens, the sliding frame having a thread portion; and

a driving motor having a screw rod, the screw rod being engaged with the thread portion to make the sliding frame movable along the screw rod, the driving motor being used to provide a driving force for making the thread portion drive the first lens and the second lens close to or away from the first light source and the second light source in parallel via the sliding frame with rotation of the screw rod.

12. The image surveillance apparatus of claim 11, wherein the sliding frame further has a main base, the thread portion has a shaft base, a torsion spring, and an elastic clamping claw, the shaft base is pivoted to the main base and has a first thread facing the screw rod, the elastic clamping claw is connected to the shaft base and has a second thread facing the screw rod, and the torsion spring is connected to the shaft base and the elastic clamping claw for providing an elastic force to drive the shaft base and the elastic clamping claw to cooperatively clamp the screw rod, so as to make the first thread and the second thread engaged with the screw rod respectively.

13. The image surveillance apparatus of claim 12, wherein the shaft base has at least one guiding claw adjacent to the elastic clamping claw, and the at least one guiding claw abuts against the screw rod to assist the shaft base and the elastic clamping claw to move along the screw rod in an undeflected manner.

14. The image surveillance apparatus of claim 11, wherein the first lens has a first curvature, the second lens has a second curvature, and the first curvature is different from the second curvature.

15. The image surveillance apparatus of claim 11, wherein the light emitting device further comprises:

a first guiding rod fixed to the casing, the first guiding rod passing through the sliding frame for guiding the first lens to move along the first guiding rod via the sliding frame.

16. The image surveillance apparatus of claim 15, wherein the light emitting device further comprises:

a second guiding rod fixed to the casing and diagonal to the first guiding rod, the second guiding passing through the second lens for guiding the second lens to move along the second guiding rod.

17. The image surveillance apparatus of claim 15, wherein the sliding frame has at least one sleeve portion formed at a position where the first guiding rod passes through the sliding frame, and the at least one sleeve portion sleeves the first guiding rod to make the sliding frame move along the first guiding rod in an undeflected manner.

18. The image surveillance apparatus of claim 11, wherein a maximum travelling distance of the first lens and second lenses relative to the first light source and the second light source is equal to a focal distance of one of the first lens and the second lens.

19. The image surveillance apparatus of claim 11, wherein the at least one lens module further comprises:

a first condensing lens disposed between the first light source and the first lens for condensing light provided by the first light source; and

a second condensing lens disposed between the second light source and the second lens for condensing light provided by the second light source.

20. The image surveillance apparatus of claim 11, wherein the lighting module further comprises a control circuit board and a heat conduction sheet, the first light source and the second light source are disposed on the control circuit board, and the heat conduction sheet is attached to the control circuit board for dissipating heat energy generated by the lighting module when the lighting module is operated.

21. The image surveillance apparatus of claim 11, wherein a heat-dissipating fin structure is formed on the housing corresponding to the light emitting device.