CN201820057U - Automatic focusing oral cavity camera with linear piezoelectric actuator - Google Patents
Automatic focusing oral cavity camera with linear piezoelectric actuator Download PDFInfo
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- CN201820057U CN201820057U CN2009203532349U CN200920353234U CN201820057U CN 201820057 U CN201820057 U CN 201820057U CN 2009203532349 U CN2009203532349 U CN 2009203532349U CN 200920353234 U CN200920353234 U CN 200920353234U CN 201820057 U CN201820057 U CN 201820057U
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Abstract
The utility model relates to an automatic focusing camera, which comprises an optical system, a movable sensor and a linear piezoelectric actuator, wherein the optical system is used for forming images of a target, the movable sensor is used for recording one group of one or a plurality of images of the target, the group of one or a plurality of images correspond to one group of one or a plurality of positions of the movable sensor, the linear piezoelectric actuator is coupled and connected to the movable sensor in a mechanical way and is used for responding the excitation to drive the movable sensor to the group of one or a plurality of positions in the preset moving direction, a driving system can actuate to generate the excitation driving the piezoelectric actuator, and an image processor responds stored instructions, obtains the group of one or a plurality of recorded images from the movable sensor, processes the group of one or a plurality of obtained recorded images and identifies images aligned with the focus.
Description
Technical field
Put it briefly, the utility model relates to the medical diagnostic equipment field, relates in particular to the dental imaging apparatus.More particularly, the utility model relates to automatic focusing intra-oral camera handled easily and high precision imaging, that have the linear piezoelectric actuator.
Background technology
Though improvement has been arranged on detection, treatment and prevention technique, carious tooth is still keeping influencing the people's of all age cohorts general situation.If can not be by correct and treatment promptly, carious tooth can cause nonvolatil tooth to damage and even cause loss of tooth.Therefore, the dental imaging based on intra-oral camera has caused great concern.
There is known intra-oral camera, such as those can (ACTEOM Inc.of Mount Laurel, NJ USA) be obtained from the ACTEON company limited in N.J. bay mountain city.In general, intra-oral camera operates on the big operating distance scope, and described scope changes between about 1 millimeter to about 50 millimeters usually.They must have the depth of field (DOF) of adjustable size simultaneously, and it is different at different operating distance places.Therefore, focus adjustment is necessary to the image quality that guarantees.Yet, for most of known intra-oral cameras, comprise that the patent No. is 6,019, intra-oral camera disclosed in the United States Patent (USP) of 721 (Holmes etc.), focus adjustment are manually to carry out by the distance that the operator regulates between lens and the imaging sensor.Traditional camera does not have to focus performance automatically and must advance independent adjusting to each image.Therefore they are inconvenient in use.
Also there is known auto-focus camera, such as the U.S. Patent application (Goldfain etc.), the patent No. that at publication number are US2008/0079897 is 6,806,988 (Onuki etc.) and 7, the camera that discloses in the United States Patent (USP) of 236,696 (Higuma etc.).These cameras early, though relatively thin from the front to the back, for imaging applications in the oral cavity, just too wide.Their automatic focus function normally realizes by the focus of regulating optical lens with respect to fixing sensor.This can move by making lens or lens combination, or realizes by the shape that changes its fluid lens that has.Traditional camera with automatic focusing performance uses though be suitable for their expections in common imaging applications, because their integral width but is not easy to be used for oral cavity internal object imaging.
Though the success that traditional auto-focus camera may acquire a certain degree in its concrete application, they can not satisfy the dimensional requirement and the operational requirements of imaging in the oral cavity.Therefore need a kind of automatic focusing intra-oral camera, its width is little, easy to use and can high precision and photographic images at high speed.
The utility model content
The purpose of this utility model provides a kind of automatic focusing intra-oral camera, and it comprises and can be moved by piezo-activator so that the removable sensor of accurately image.
Another purpose of the present utility model provides a kind of automatic focusing intra-oral camera, and it comprises and can be no more than 0.2 second, more preferably be no more than 0.1 second and most preferably be no more than and be the piezo-activator of target imaging in 0.05 second.
Another purpose of the present utility model provides a kind of automatic focusing intra-oral camera, and it has and is no more than 20 millimeters, more preferably is no more than 15 millimeters and the width that most preferably is no more than 5 millimeters.
The utility model has the advantages that the camera width of institute's utility model is little, easy to use, and can be with high precision and automatically take the intraoral image of patient at a high speed.
These purposes only provide by the mode of example, and these purposes can be the examples of one or more embodiments of the present utility model.For a person skilled in the art, can expect the purpose and the advantage of other expectation of obtaining naturally by disclosed utility model, and these purposes and advantage will become clearly.The utility model is limited by the accompanying claims.
According to an aspect of the present utility model, a kind of auto-focus camera is provided, it comprises: optical system, it is used to form the image of target; Removable sensor, it is used to write down one group of one or more image of described target, and this organizes the one group one or more positions of one or more images corresponding to described removable sensor; The linear piezoelectric actuator, it mechanically is coupled to described removable sensor, is used in response to excitation described removable sensor being urged to this along pre-motion orientation and organizes one or more positions; Drive system, it can activate the excitation that drives described piezo-activator to produce; And image processor, it obtains this from described removable sensor and organizes one or more document images, handles one or more document images that obtain of this group and identification image in focus in response to the instruction of storage.
According on the other hand of the present utility model, the auto-focus camera that provides, it comprises: optical system, it is used to form the image of target; Removable sensor, it is used to write down the described image of described target; The linear piezoelectric actuator, it mechanically is coupled to described removable sensor, is used for driving described removable sensor in response to excitation along pre-motion orientation; Drive system, it can activate to provide and drive described piezo-activator so that the excitation of described removable sensor motion; And image processor, it is connected to described drive system and described removable sensor, wherein, described processor in response to the storage instruction to activate described drive system, thereby produce the excitation that drives described piezo-activator, described piezo-activator and then make described removable sensor move to optimum position, described sensor writes down the image of described target in this position.
Description of drawings
As shown in the drawing, set forth more specifically according to the following of a plurality of embodiments of the present utility model, aforementioned and other purpose, feature and advantage of the present utility model will become very obvious.Element in the accompanying drawing is not necessarily according to each other scale.
Fig. 1 shows the skeleton view of auto-focus camera of the present utility model;
Fig. 2 shows the system configuration according to auto-focus camera of the present utility model.
Embodiment
Be detailed description of the preferred embodiment of the present utility model below, simultaneously with reference to accompanying drawing, in the drawings, identical reference number is represented same structural detail in each figure.
Fig. 1 shows the auto-focus camera of the present utility model 10 according to an embodiment.Auto-focus camera 10 comprises optical system 12, removable sensor 14, linear piezoelectric actuator 16, drive system 18 and image processor 20.Fig. 2 shows according to the system configuration of the auto-focus camera of the present utility model 10 of an embodiment and has explained principle of work of the present utility model.
Auto-focus camera 10 is intended to be used to intraoral target 1 imaging of patient, and makes things convenient for and accurately carry out imaging.For example, target 1 can be a tooth.Imaging operation be no more than in 0.2 second, more preferably be no more than in 0.1 second, most preferred being no more than in 0.05 second finish.The high speed imaging of this automatic focusing mainly is owing to the piezo-activator 16 that has used with the speed responsive of about 50 to 100 mm/second.With this speed, piezo-activator 16 can be in the oral cavity in the common range of movement of imaging circumstances---such as in scope approximately+/-3 millimeter---promptly makes sensor 14 motions.Because piezo-activator 16 accurate localization resolution have realized the high precision with the image of auto-focus camera 10 shootings.In one embodiment, the linear movement of the average about 0.5-1.0 micron of per step of piezo-activator 16 generations.
Alternatively, auto-focus camera 10 also comprises illuminator 24, and it is configured to guide the light from light source, thereby illuminates target 1 to improve the imaging at removable sensor 14 places.This light source can be one or more light emitting diodes (LED) or any other known light source.Illuminator 24 can be integrated in auto-focus camera 10 packings or can be provided by independent device.Optical fiber or other light guide can be provided for from external light source and guide illumination to target 1.
In one embodiment, linear piezoelectric actuator 16 piezo-electric motor for being coupled with removable sensor 14 machineries, and itself and drive system 18 communicate to connect.Drive system 18 provides excitation, for example signal or electric current, thus it activates linear piezo-activator 16 and moves along predetermined direction 22.As shown in the figure, predetermined direction 22 is parallel with the axial direction of auto-focus camera 10 basically.Drive system 18 can be actuatable maybe can exciting to produce any known system or the parts of signal---perhaps more put it briefly is the excitation that is applicable to the drive pressure electric notor---.In an example, drive system 18 comprises integrated circuit (IC) driver.Concerning the technician of electronic applications, the IC driver that is used for piezo-activator is familiar with.
Thereby piezo-activator 16 is a kind of motors that use piezoelectric response to produce linear movement, and it only comprises few parts usually: driving element, actuator pad, driving stem and spring.In one example, when response ratio such as electronic signal equal excitation and when activateding, driving element vibrates with ultrasonic frequency.Actuator pad is used to from driving element to the driving stem transmitting movement, and it is because the flexural wave (flexural wave) in the driving element and can moving in the sinusoidal curve mode.Actuator pad only contacts with driving stem in the half period process; Therefore, driving stem will move forwards or backwards a step in each electron period.Spring is used for producing friction or loading force between actuator pad and driving stem.In response to electronic signal or other excitation, the driving stem of piezo-activator 16 accurately (for about 0.5-1.0 micron of average per step of common device) and easily (with the about 50-100 speed of milli/second) move along the direction of motion 22 of being scheduled to.
Though as a rule piezo-activator can produce along three directions and move, according to embodiment of the present utility model, linear piezoelectric actuator 16 only produces motion at predetermined direction 22.Because the motion of piezo-activator 16, the position translation of removable sensor 14 perhaps is pushed or is drawn, thereby moves along predetermined direction 22.This activity and then change distance between removable sensor 14 and the optical system 12 again.At some the some place along predetermined direction 22, removable sensor 14 is disposed the focus to the most close optical system 12.
By using linear piezoelectric actuator 16, auto-focus camera 10 of the present utility model can be done little aspect width W.For using in the oral cavity, width W should be no more than 20 millimeters, more preferably is no more than 15 millimeters, most preferably is no more than 5 millimeters.Come for camera 10 cosily being configured in patient's mouth and with auto-focus camera 10 of the present utility model and traditional prior art auto-focus camera difference of many other types that are used for other use, this narrow and small width demand is necessary.
Use known method usually, such as the sharpness of utilizing the Hi-pass filter computed image (sharpness), can be to each the assessment focus level in the image that has obtained.20 pairs of each elements that should organize in one or more acquired document images of image processor calculate sharpness.The document image that has high definition in this group be determined be in focus and relevant with the optimum position of removable sensor 14.In its motion control function, by being connected with drive system 18, image processor 20 can send one or more pulses to drive system 18 with as motion-activated.The quantity of pulse is associated with the motion of removable sensor 14 to different positions.By this way, image processor 20 command-driven systems 18 are driven into different positions with removable sensor 14.In order to arrive each different position, as required, linear piezoelectric actuator 16 accurately and drive removable sensor 14 expediently and advance or retreat along predetermined direction 22.At its optimum position, promptly nearest optimum focal point place, the picture rich in detail of removable sensor 14 record objects 1.In general, this is the image that can be displayed to camera operator subsequently, be further processed and be stored for following reference.
In the embodiment of Fig. 1, image processor 20 is a special microprocessor, and it is incorporated in the interior compact size of auto-focus camera 10 packings.Alternatively, for example, image processor 20 can be placed on hand held camera, such as being associated on the part of operator's control desk or with display.For example, image processor 20 can be outside computer workstation, portable computer or other logic processing device that connects, and comprises the networking processing device.Image processor 20 communicates to connect with removable sensor 14 and drive system 18, is used to obtain and provides required data and signal for it.It can or---can be wireless by one or more lines alternatively---that this between removable sensor 14 and drive system 18 and the external image processor 20 communicates to connect.
Though auto-focus camera 10 purposes of the present utility model are to be intraoral target imaging,, it also can be used in other application that is fit to, and the quite restricted occasion of the width requirement of camera particularly is such as being used for endoscopic applications.
Different with traditional automatic focusing mechanism, auto-focus camera 10 of the present utility model passes through to move the position adjustments focal length of removable sensor 14, rather than carries out any adjusting by the optical devices to camera.The use of piezo-activator makes sensor 14 to reach fast with fractional increments along moving direction 22 and accurately reorientates, thereby takes continuous images.The quick calculating of image definition and other picture characteristics makes image processor 20 can promptly determine pinpointed focus.Like this, the robotization of image taking and focus adjustment process makes that image can promptly be obtained and minimize operator's the training and the demand of subjective judgement in the oral cavity.
By the present preferred forms of concrete reference, elaborated the utility model, but should be appreciated that in spirit and scope of the present utility model and can realize multiple modification and remodeling.For example, do not specifically illustrate the operator's controller that starts image shoot process, but it can be set on the body of auto-focus camera 10 or independently on operator's control desk.As mechanical field the technician understood, be used to produce machinery linear movement, linear piezoelectric actuator 16 and removable sensor 14 and be coupled and can realize in several ways and can comprise spring, STATEMENT OF FEDERALLY SPONSORED or other parts.Therefore, disclosed embodiment should be thought only for exemplary and nonrestrictive with regard to each side now.Scope of the present utility model is shown that by appending claims all modifications of being done all is intended to be included in this scope in the meaning that is equal to therewith and scope.
The element tabulation:
1 target
10 auto-focus cameras
12 optical systems
14 removable sensors
15 lines
16 piezo-activators
18 drive systems
20 image processors
22 direction of motion
24 illuminators
Claims (8)
1. automatic focusing intra-oral camera, it comprises:
Optical system, it is used to form the image of target;
It is characterized in that:
Removable sensor, it is used to write down one group of one or more image of described target, and this organizes the one group one or more positions of one or more images corresponding to described removable sensor;
The linear piezoelectric actuator, it mechanically is coupled to described removable sensor, is used in response to excitation described removable sensor being urged to this along pre-motion orientation and organizes one or more positions;
Drive system, it can activate the excitation that drives described piezo-activator to produce; And
Image processor, it obtains this from described removable sensor and organizes one or more document images, handles one or more document images that obtain of this group and identification image in focus in response to the instruction of storage.
2. automatic focusing intra-oral camera as claimed in claim 1 further comprises being used for the illuminator of light guide to described target.
3. automatic focusing intra-oral camera as claimed in claim 1, wherein, described linear piezoelectric actuator is connected to described removable sensor by line.
4. automatic focusing intra-oral camera as claimed in claim 1, wherein, described image processor further sends one or more pulses to described drive system, and the quantity of described pulse is corresponding to the diverse location of described removable sensor.
5. automatic focusing intra-oral camera, it comprises:
Optical system, it is used to form the image of target;
It is characterized in that:
Removable sensor, it is used to write down the described image of described target;
The linear piezoelectric actuator, it mechanically is coupled to described removable sensor, is used for driving described removable sensor in response to excitation along pre-motion orientation;
Drive system, it can activate to provide and drive described piezo-activator so that the excitation of described removable sensor motion; And
Image processor, it is connected to described drive system and described removable sensor,
Wherein, described processor in response to the storage instruction to activate described drive system, thereby produce to drive the excitation of described piezo-activator, described piezo-activator and then make described removable sensor move to optimum position, described sensor writes down the image of described target in this position.
6. automatic focusing intra-oral camera as claimed in claim 5, wherein, described piezo-activator moves along the average velocity of described pre-motion orientation with about 50-100 mm/second.
7. automatic focusing intra-oral camera as claimed in claim 5, wherein, described image is that first image and described sensor further write down second image, the sharpness of more described first image of described processor and second image.
8. automatic focusing intra-oral camera as claimed in claim 5, wherein, described image processor sends one or more pulses to described drive system, and the quantity of described pulse is corresponding to the position of described removable sensor with respect to described optimum position.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203532349U CN201820057U (en) | 2009-12-30 | 2009-12-30 | Automatic focusing oral cavity camera with linear piezoelectric actuator |
| US12/763,232 US8305486B2 (en) | 2009-12-30 | 2010-04-20 | Auto-focus intra-oral camera having a linear piezoelectric actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203532349U CN201820057U (en) | 2009-12-30 | 2009-12-30 | Automatic focusing oral cavity camera with linear piezoelectric actuator |
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| Publication Number | Publication Date |
|---|---|
| CN201820057U true CN201820057U (en) | 2011-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009203532349U Expired - Fee Related CN201820057U (en) | 2009-12-30 | 2009-12-30 | Automatic focusing oral cavity camera with linear piezoelectric actuator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116996A (en) * | 2009-12-30 | 2011-07-06 | 卡尔斯特里姆保健公司 | Automatic focusing camera with linear piezoelectric actuator for inside of oral cavity |
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2009
- 2009-12-30 CN CN2009203532349U patent/CN201820057U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116996A (en) * | 2009-12-30 | 2011-07-06 | 卡尔斯特里姆保健公司 | Automatic focusing camera with linear piezoelectric actuator for inside of oral cavity |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110504 Termination date: 20181230 |