Patents by Inventor Ralph S. Hafle

Ralph S. Hafle has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5017772
    Abstract: A fiber optic probe sensor for accurate measurement of displacement of a target over very small distances is disclosed. The probe sensor is comprised of plurality of light emitting fibers exclusively occupying a central region and connected to a light source for illuminating the target; a first and second plurality of light receiving fibers arrayed in two concentric regions exterior to and at two different distances from the central region, and means for measuring reflected light received from the target and for generating an output proportional to the light received and independent of target reflectivity or light source variation.
    Type: Grant
    Filed: May 30, 1989
    Date of Patent: May 21, 1991
    Assignee: BEI Electronics, Inc.
    Inventor: Ralph S. Hafle
  • Patent number: 4628298
    Abstract: A positional encoder which provides absolute position information from a single code track. A chain code track is positioned on a code disk to supply position words of N consecutive bits, each position word being unique and corresponding to a different position of the code disk. Means are provided for detecting the elements of the chain code as the code disk is rotated with respect to a fixed point. The position data are accumulated in the order received and N consecutive bits are examined to determine the position to which the bits correspond.
    Type: Grant
    Filed: June 22, 1984
    Date of Patent: December 9, 1986
    Assignee: BEI Motion Systems Company, Inc.
    Inventors: Ralph S. Hafle, Mark D. Love
  • Patent number: 4362358
    Abstract: A multidigit fiber optic encoder having only one or two fiber optic cables between an active zone containing a light source and photodetectors, and a passive zone containing a multidigit code member having a multitude of code tracks. First and second sets of color filters are associated with the code tracks and the photodetectors, so that each code track modulates light of a different color, which is transmitted to only the corresponding photodetector. The light beams of the different colors are combined for transmission between the passive and active zones. A single fiber optic cable may be employed between the active and passive zones for transmitting light in both directions, by providing first and second beam splitters at the active and passive ends of the cable to split the transmitted and received light. Alternatively, two fiber optic cables may be employed to transmit light in the opposite directions, to obviate any need for the beam splitters.
    Type: Grant
    Filed: August 13, 1980
    Date of Patent: December 7, 1982
    Assignee: BEI Electronics, Inc.
    Inventor: Ralph S. Hafle
  • Patent number: 3976997
    Abstract: The disclosed encoder is adapted to produce both digital and analog output signals corresponding to the angular position of a rotary shaft, or the position of any other movable member. The digital signals comprise a series of binary signals constituting a multi-digit code word which defines the angular position of the shaft with a degree of resolution which depends upon the number of digits in the code word. The basic binary signals are produced by photocells actuated by a series of binary tracks on a code disc or member. The analog signals are in the form of a series of ramp signals which are related in length to the least significant bit of the digital code word. The analog signals are derived from sine and cosine tracks on the code disc. Such tracks are read by photocells which produce signals corresponding to the sine and cosine of the shaft angle.
    Type: Grant
    Filed: June 14, 1972
    Date of Patent: August 24, 1976
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventor: Ralph S. Hafle
  • Patent number: 3974428
    Abstract: The disclosed system utilizes digital electronic programming to establish the rotational or translational speed of a motor driven member. The desired speed can be selected by manipulating a set of digital switches. A stable oscillator is employed to generate a high frequency signal which is processed by frequency dividers to produce a modulaton frequency signal. The modulation frequency is supplied to an optical encoder having a rotary shaft adapted to be connected to a rotary member, the speed of which is to be controlled. The encoder is constructed and arranged to produce a phase variable output signal at the modulation frequency, the phase of such output signal being variable as a function of the shaft angle.
    Type: Grant
    Filed: May 15, 1974
    Date of Patent: August 10, 1976
    Assignee: Baldwin Electronics, Inc.
    Inventor: Ralph S. Hafle