Device for transmitting measurement data from a rotating body

• US 4,518,962 A
• Filed: 12/17/1981
• Issued: 05/21/1985
• Est. Priority Date: 12/17/1981
• Status: Expired due to Fees

• Current Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited), Teijin Limited
• Original Assignee: Fuji Electric Company Limited (Fuji Electric Systems Company Limited), Teijin Limited
• Inventors: Misawa, Takashi, Takeuchi, Hironori, Imose, Kazuo, Yamamuro, Kiyoshi
• Primary Examiner(s): Groody, James J.
• Application Number:
  US06/331,552
• Time in Patent Office: 1,251 Days
• Field of Search: 340/870.32, 340/870.34, 340/870.28, 340/870.29, 340/870.37, 340/672, 340/671, 340/870.01, 340/870.17, 361/395, 361/412, 361/415, 374/153, 374/154
• US Class Current: 340/870.28
• CPC Class Codes: G01K 1/024 for remote indication
• CPC Class Codes: G01R 31/34 Testing dynamo-electric machines
• CPC Class Codes: G08C 23/04 using light waves, e.g. infrared
• CPC Class Codes: H05K 1/14 Structural association of two or more printed circuits providing electric connection to or between printed circuits H05K1/11, H01R12/00
• CPC Class Codes: H05K 1/148 Arrangements of two or more hingeably connected rigid printed circuit boards, i.e. connected by flexible means

Abstract

In the transmission of measurement data from a rotating body to a stationary receiver, a rotary signal transmitter mounted on a rotating shaft employs a printed circuit. A printed circuit board assembly for the rotary transmitter has a plurality of evenly circumferentially distributed printed circuit boards which have their electronic components facing radially inwardly so as to resist damage due to centrifugal force resulting when the shaft and boards rotate. Connecting wires connect the assembly to a temperature sensor and the signal corresponding to the temperature is transmitted via a light-emitting element to a light-sensitive element of the receiver. Another arrangement employs rotationally balanced printed circuit discs extending radially. Multiplexing means may also be provided.

Claims

1. An apparatus for a signal transmitter for mounting on the axis of rotation of a rotating body, comprising a rotary printed circuit board assembly further comprisprising at least two generally planar printed circuit boards having electronic components mounted thereon, said circuit boards being mounted in said assembly so that when the rotating body rotates, the resultant centrifugal force acting on the electronic components will be substantially free of net vector force components directly urging the electronic components away from the plane of the printed circuit boards, including a bobbin-shaped attachment base having a pair of flanges, and wherein components are secured and mounted to the surfaces of said printed circuit boards which face radially inwardly, and wherein said printed circuit boards are mounted on said pair of flanges and around said attachment base in a circumferentially spaced and cylindrical arrangement.

2. The apparatus according to claim 1, wherein at least three printed circuit boards are provided, and wherein each of said flanges is polygonal having a number of sides equal to the number of circuit boards, and wherein each printed circuit board is secured to a different polygonal side.

3. The apparatus according to claim 1, including a binder wound around the arrangement of said printed circuit boards to fasten the boards together.

4. The apparatus according to claim 1, wherein the printed circuit boards are secured to the flanges by means of screws.

5. An apparatus for a signal transmitter for mounting on the axis of rotation of a rotating body, comprising a rotary printed circuit board assembly further comprising at least one generally planar printed circuit board having electronic components mounted thereon, said circuit board being mounted in said assembly so that when the rotating body rotates, the resultant centrifugal force acting on the electronic components will be substantially free of net vector force components directly urging the electronic components away from the plane of the printed circuit board, wherein the rotating body comprises a rotational shaft and the printed circuit board assembly is mounted on the rotational shaft, wherein the signal transmitter is a signal transmission device comprising a light-emitting element, and end attachment base removably secured to the axial end of the printed circuit board assembly and which centrally supports the light-emitting element, said light-emitting element having its optical axis held in alignment with a central axis of the rotational shaft.

6. A signal transmitter apparatus mounted on a rotating body, comprising a rotary printed board assembly which further comprises at least two generally planar printed circuit boards each mounted in a plane generally normal to a radial line originating at the rotational axis of the rotational body and with the electrical component mounting surface of the board facing radially inwardly, whereby the electrical components are substantially free of net vector force components urging the components away from the plane of their printed circuit board when the rotating body rotates, including a bobbin-shaped attachment base having a pair of flanges, and wherein components are secured and mounted to the surfaces of said printed circuit boards which face radially inwardly, and wherein said printed circuit boards are mounted on said pair of flanges and around said attachment base in a circumferentially spaced and cylindrical arrangement.

7. The apparatus according to claim 6, wherein at least three printed circuit boards are provided, and wherein each of said flanges is polygonal having a number of sides equal to the number of circuit boards, and wherein each printed circuit board is secured to a different polygonal side.

8. The apparatus according to claim 6, including a binder wound around the arrangement of said printed circuit boards to fasten the boards together.

9. The apparatus according to claim 6, wherein the printed circuit boards are secured to the flanges by means of screws.

10. A signal transmitter apparatus mounted on a rotating body, comprising a rotary printed board assembly which further comprises at least one generally planar printed circuit board mounted in a plane generally normal to a radial line originating at the rotational axis of the rotating body, and with the electrical component mounting surface of the board facing radially inwardly, whereby the electrical components are substantially free of net vector force components urging the components away from the plane of their printed circuit board when the rotating body rotates, wherein the rotating body comprises a rotational shaft and wherein the printed circuit board assembly is mounted on the rotational shaft, wherein the signal transmitter is a signal transmission device comprising a light-emitting element, and an end attachment base removably secured to the axial end of the printed circuit board assembly and which centrally supports the light-emitting element, said light-emitting element having its optical axis held in alignment with a central axis of the rotational shaft.