US 6,487,517 B2Granted

Target for photogrammetric analytical measurement system

AssigneePENTAX Corporation

InventorsTeruo Sakai, Atsumi Kaneko

Life of this patent

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Abstract

A control unit box and one of standard point members are provided close to a connection of first and second bars. A standard plane is defined by the standard point members. A loop antenna is provided in a mount unit situated on the top surface of the control unit box. The box is positioned such that a ratio of a second distance to a first distance is less than tan 8°. The first distance is from the point member to the mount unit, along the standard plane, and the second distance is from the standard plane to the top surface of the mount unit, along a direction perpendicular to the standard plane. The antenna is connected to an oscillator of 310 MHz. With respect to the antenna, the total length is approximately 0.48 m, a height from the top surface of the unit box is approximately 9.5 mm, and the inner diameter is approximately 25 mm.

Claims7

Dependent claims

A target for photogrammetric analytical measurement system comprising:

a first bar and a second bar which are connected at adjacent end portions;
indicating members that are able to be recognized in a photographed image by a camera, being placed on said first and second bars so as to define an identical plane;
a box in which sensors for detecting data utilized to calculate a photographing position of said camera, being provided on said first bar or said second bar at a position close to said connecting end portions;
a loop antenna that transmits said data detected by said sensors to an outer device;
and
a projecting portion in which said loop antenna is provided, being placed on said box at a side at which said indicating members are placed on said first and second bars,
wherein, a relationship between a first distance K1 and a second distance K2 are defined by an expression to follow, said first distance K1 being along said identical plane between a first indicating member of said indicating members which is positioned close to said connecting end portions and said projecting portion, and said second distance K2 being along a direction perpendicular to said identical plane between a top surface of said projecting portion and said identical plane
K2/K1<tan 8°.

5 more elements

Dependencies are inferred from the claim text.