# US 5,345,305 A · Aquarium light meter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,345,305 A - Document ID: US5345305A - Status: Granted - Kind: A - Application number: 08/051,158 - Filed: 1993-04-22 - Granted: 1994-09-06 - Earliest claimed: 1993-04-22 - Inventors: Chi-Der Chen - Web page: https://patentgrep.com/patent/US5345305A ## CPC - G01J 1/04: Optical or mechanical part {supplementary adjustable parts} - G01J 1/42: using electric radiation detectors (optical or mechanical part G01J1/04; by comparison with a reference light or electric value G01J1/10) - G01J 1/0271: {Housings; Attachments or accessories for photometers} - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) ## Abstract This invention relates to an aquarium light meter including a light sensing device, a pivotal assembly connecting the light sensing device to a pair of telescopic tubes, a controller, and a signal wire connected to the light sensing device and passing through the pivotal assembly and telescopic tubes for connection to the controller. The aquarium light meter is adjustable in length and direction of light detection in accordance with the shape of the aquarium and the location of ornaments therein so that the light intensity at any predetermined portions of the aquarium can be precisely detected. ## Claims ### Claim 1 An aquarium light meter comprising: a light sensing device having a housing, a base cover, a transparent lens, and a light sensor; said housing having one end with a pair of lugs thereat, said housing having an upper wall provided with a circular opening, said transparent lens being fitted within said opening, said light sensor being adhered onto an interior surface of said base cover, said base cover being connected to said housing to seal said light sensing device; a pivotal means including a guide tube, having a pair of lugs at one end, said guide tube being provided with a hole; a telescopic tube assembly including an inner tube and an exterior tube; a tube cover having a central hole fitted over a front end of said exterior tube; a controller having a two-step light meter, a two-step switch, and a housing; and a signal wire having one end connected to said light sensor and passing through said housing of said light sensing device, said pivotal means, said telescopic tube assembly, and said tube cover, an opposite end of said signal wire being connected to said controller; said light sensor being axially aligned with said lens, an appropriate amount of waterproof adhesive material being applied within said housing of said light sensing device, at a juncture between said lens and said base cover, and at a portion of said housing through which said signal wire passes; a distance between said lugs of said housing measured from outside being approximately equal to a distance between said lugs of said pivotal means measured from inside, a center portion of an outer surface of each housing lug having a recess, a center portion of an inner surface of each lug of said pivot means including a protrusion which pivotally engages in a respective said recess; said guide tube of said pivotal means being fitted snugly into the hole in said inner tube, said inner tube being fitted into the hole of said exterior tube in a slidable manner, said inner tube being provided with two grooves symmetrically arranged at a periphery thereof which terminate at a short distance from a front end of said inner tube; two guide ribs symmetrically arranged at an inner surface of a remote end of said exterior tube so that as said inner and exterior tubes are assembled, the guide ribs guide said inner tube to slide linearly without rotation, and cooperate with said grooves to achieve a positioning effect. ### Claim 2 (depends on 1) The aquarium light meter as claimed in claim 1, wherein an inner surface of said base cover of said light sensing device is provided with a plurality of positioning protrusions to facilitate the precise positioning of said light sensor. ### Claim 3 (depends on 1) The aquarium light meter as claimed in claim 1, wherein said inner tube is slightly longer than said exterior tube. ### Claim 4 (depends on 3) The aquarium light meter as claimed in claim 3, wherein the length of said inner tube is in the range of 70 to 75 centimeters. ### Claim 5 (depends on 1) The aquarium light meter as claimed in claim 1, wherein said housing, base cover, and pivotal means are formed of non-conductive, flexible plastic material. ### Claim 6 (depends on 1) The aquarium light meter as claimed in claim 1, wherein said inner and exterior tubes are formed of plastic material with high flexibility. ### Claim 7 The aquarium light meter as claimed in claim wherein said tube cover is made of flexible rubber material.