Flashlight with photovoltaic power source

• US 7,670,023 B1
• Filed: 05/15/2007
• Issued: 03/02/2010
• Est. Priority Date: 05/15/2006
• Status: Active Grant

• Current Assignee: Terry J. Peterson
• Original Assignee: Terry J. Peterson
• Inventors: Peterson, Terry J.
• Primary Examiner(s): Ward; John A
• Application Number:
  US11/748,756
• Time in Patent Office: 1,022 Days
• Field of Search: 362/158, 362/183, 362/109, 362/253, 362/184, 362/202, 362/208, 320/101, 320/14, 320/115, 320/136
• US Class Current: 362/183
• CPC Class Codes: F21L 4/027 the light sources being a LED
• CPC Class Codes: F21L 4/08 characterised by means for in situ recharging of the batteries or cells
• CPC Class Codes: F21V 23/0414 specially adapted to be used with portable lighting devices
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H02S 40/38 Energy storage means, e.g. batteries, structurally associated with PV modules
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y02E 70/30 Systems combining energy storage with energy generation of non-fossil origin

Abstract

A flashlight including a photovoltaic power source adapted to convert incident light energy to electrical energy and wherein the flashlight is configured such that the flashlight is induced to orient the photovoltaic power source to face upwards when the flashlight is placed on a generally horizontal surface. The flashlight can include a rechargeable battery pack so as to have a hybrid power supply. Also, a method of powering a flashlight including attaching at least one solar cell to a body of a flashlight, connecting the at least one solar cell to a battery such that electrical output of the solar cell can charge the battery, and connecting a switch and a lamp to the at least one solar cell and the battery such that a user can actuate the switch to connect the battery to the solar cell for charging of the battery or to the lamp for generation of light from the flashlight.

Claims

1. A flashlight comprising:

a housing having a first and second end and a length and defining at least one opening at the first end;

a photovoltaic panel arranged generally within the opening such that incident light can pass through the opening and impinge the photovoltaic panel and such that the photovoltaic panel extends along the length of the housing;

at least one power storage element comprising a rechargeable battery cell secured within the housing so as to define a mass asymmetry of the flashlight such that gravity acts to induce the photovoltaic panel generally towards an upwards facing orientation;

a reserve power storage element operable to provide supplemental power for the flashlight;

a multi-position switch configured to allow a user to select between power storage elements for operating power of the flashlight;

an indicator to indicate a currently selected power storage element; and

an indicator configured to indicate when the photovoltaic panel is generating electrical energy.

2. The flashlight of claim 1, further comprising a cover connected to the housing and configured to inhibit exposure of the photovoltaic panel to debris and environmental exposure and to provide an ergonomic grasping surface.