Apparatus for determining optical characteristics of an object

• US 5,745,229 A
• Filed: 01/02/1996
• Issued: 04/28/1998
• Est. Priority Date: 01/02/1996
• Status: Expired due to Term

• Current Assignee: JJL Technologies, L.L.C., RPX Corporation
• Original Assignee: LJ Laboratories L.L.C.
• Inventors: Jung, Wayne D., Jung, Russell W., Loudermilk, Alan R.
• Primary Examiner(s): EVANS, FANNIE L
• Application Number:
  US08/581,851
• Time in Patent Office: 847 Days
• Field of Search: 356/402, 356/405, 356/406, 356/407, 356/416, 356/425, 356/445, 356/446, 356/73, 356/417, 356/371
• US Class Current: 356/73
• CPC Class Codes: A61B 2560/0233 Optical standards
• CPC Class Codes: A61C 19/10 Supports for artificial teeth for transport or for comparison of the colour
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0218 using optical fibers
• CPC Class Codes: G01J 3/04 Slit arrangements slit adjustment
• CPC Class Codes: G01J 3/10 Arrangements of light sources specially adapted for spectrometry or colorimetry
• CPC Class Codes: G01J 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/50 using electric radiation detectors
• CPC Class Codes: G01J 3/508 measuring the colour of teeth
• CPC Class Codes: G01J 3/51 using colour filters
• CPC Class Codes: G01J 3/513 having fixed filter-detector pairs
• CPC Class Codes: G01J 3/524 Calibration of colorimeters
• CPC Class Codes: G01N 21/474 Details of optical heads therefor, e.g. using optical fibres
• CPC Class Codes: G01N 21/57 Measuring gloss

Abstract

Color measuring systems and methods are disclosed. Perimeter receiver fiber optics are spaced apart from a central source fiber optic and receive light reflected from the surface of the object being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object being measured. Under processor control, the color measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention.

Claims

1. An apparatus for measuring optical characteristics of an object with a probe as the probe is moved with respect to the object, comprising:

a probe having a central light source and a plurality of light receivers spaced apart from the central light source, wherein light from the central light source is reflected from the object into the plurality of light receivers;

first and second sensors coupled to receive light from the light receivers, wherein at least some of the second sensors measure the value of the intensity of light in predetermined color bands;

a processor coupled to receive data from the first and second light sensors;

wherein the processor monitors intensity values determined by the first sensors and stores data from the second sensors based on the intensity determinations made by the first sensors, wherein the stored data is indicative of optical characteristics of the object.

2. An apparatus for determining optical characteristics of an object, comprising:

a probe movable to be in proximity to the object, wherein the probe provides light to the surface of the object from one or more light sources, and receives light reflected from the object through a plurality of light receivers;

first sensors for determining the intensity of reflected light received by more than one of the light receivers; and

second sensors for measuring the optical characteristics of the object based on light received by one or more of the light receivers in response to the intensity determinations made by the first sensors, wherein the measurement produces data indicative of the optical characteristics of the object.

3. The apparatus of claim 2, wherein the optical characteristics of the object comprise color characteristics.

4. The apparatus of claim 2, wherein the optical characteristics of the object comprise translucence characteristics.

5. The apparatus of claim 2, wherein the optical characteristics of the object comprise fluorescence characteristics.

6. The apparatus of claim 2, wherein the optical characteristics of the object comprise surface texture characteristics.

7. The apparatus of claim 2, wherein the probe comprises one or more light source fiber optics coupled to a light source and a plurality of light receiver fiber optics coupled to the first and second sensors.

8. The apparatus of claim 2, wherein the plurality of light receivers are each spaced a first distance from a first light source on the probe, and wherein the plurality of light receivers are spaced apart from adjacent light receivers on the probe by a second distance.

9. The apparatus of claim 8, wherein the probe comprises three light receivers spaced around the first light source, wherein the light receivers are spaced apart from adjacent light receivers with an angular spacing of about 120 degrees.

10. The apparatus of claim 2, wherein the first sensors comprise light measuring sensors measuring the same bandwidth, and wherein the second sensors comprise a color spectrophotometer.

11. The apparatus of claim 10, wherein the second sensors comprise a plurality of filters optically coupled to a plurality of light measuring devices.

12. The apparatus of claim 11, wherein the filters comprise filters that pass light of predetermined frequencies of received light.

13. The apparatus of claim 2, wherein the first sensors comprise light measuring sensors measuring the same bandwidth, and wherein the second sensors comprise a color tristimulus measuring device.

14. The apparatus of claim 2, wherein a processor processes the measured data and displays a representation corresponding to the measured data on a display device.

15. The apparatus of claim 14, wherein the processor is coupled to a computer, wherein the computer processes data received from the processor.

16. The apparatus of claim 14, further comprising an audio unit coupled to the processor for generating audio information, wherein the audio information is indicative of the status of the optical characteristics determination.

17. The apparatus of claim 2, wherein the probe has a removable cover element.

18. The apparatus of claim 17, wherein the removable cover element comprises a shield.

19. The apparatus of claim 17, wherein the removable cover element is positioned on the probe prior to measuring the object.

20. The apparatus of claim 17, wherein the removable cover element is sterilized prior to being positioned on the probe.

21. The apparatus of claim 2, wherein the probe has a removable tip.

22. The apparatus of claim 21, wherein the removable tip is positioned on the probe prior to measuring the object.

23. The apparatus of claim 21, wherein the removable tip is sterilized prior to being positioned on the probe.

24. The apparatus of claim 2, wherein a processor monitors the intensity values determined by the first sensors by:

determining a first peak intensity value with one or more of the first sensors as the probe is moved towards the object; and

determining a second peak intensity value with one or more of the first sensors as the probe is moved away from the object.

25. The apparatus of claim 24, wherein the optical characteristics of the object are determined with the second sensors when the first and second peak intensity values are substantially equal.

26. The apparatus of claim 24, wherein the processor:

compares the first and second peak intensity values;

accepts the data measured by the second sensors if the compared first and second peak intensity values are within a predetermined range; and

rejects the data measured by the second sensors if the compared first and second peak intensity values are outside the predetermined range.

27. The apparatus of claim 26, further comprising an audio unit coupled to the processor, wherein the audio unit:

generates first audio information if the measured data is accepted; and

generates second audio information if the measured data is rejected.

28. The apparatus of claim 26, wherein the predetermined range may be modified by a user.

29. The apparatus of claim 24, wherein the processor determines an intermediate intensity value with the first sensors at a time intermediate between the time when the first and second peak intensity values are determined, wherein the intermediate intensity value corresponds to the translucence of the object.

30. The apparatus of claim 29, wherein the intermediate intensity value is determined when the probe is in contact or near contact with the object.

31. The apparatus of claim 2, wherein the optical characteristics of the object are measured without the probe contacting the object.

32. The apparatus of claim 2, wherein the object is measured at a time when a plurality of the first sensors measure peak intensity values as the probe moves with respect to the object.

33. The apparatus of claim 2, wherein the object is measured when the probe is at a predetermined distance from the object.

34. The apparatus of claim 2, wherein the object is measured when the probe is at a predetermined distance and angle with respect to the object.

35. The apparatus of claim 14, further comprising a material mixing unit coupled to receive data from the processor, wherein the material mixing unit prepares constituent materials for a second object based on the stored data indicative of the optical characteristics of the object, wherein the constituent materials of the second object are selected based on the stored data.

36. An apparatus for measuring the color of an object with a probe as the probe is moved with respect to the object, comprising:

a probe having a central light source and a plurality of light receivers spaced apart from the central light source, wherein light from the central light source reflects into the plurality of light receivers;

sensors coupled to receive light from the light receivers, wherein at least some of sensors measure the value of the intensity of light in predetermined color bands;

a processor coupled to receive data from the light sensors;

wherein the processor monitors the intensity values for one or more of the light receivers and stores data from the sensors at time when the one or more light receivers have a peak intensity value.