40 results about "Reflection illumination" patented technology

The invention discloses a fundus imaging system, which includes an optical path folding lens set, a virtual reality display, visible light fixation lamps, an illumination module, an image sensor, and a processor. The virtual reality display and the human eye are located on different sides of the optical path folding lens set. The virtual reality display forms images on the retina of the fundus of the human eye through the optical path folding lens set. The visible light fixation lamps are sequentially turned on to guide the eyeball of the human eye to rotate. When the visible light fixation lamp is turned on, the illumination module emits illumination light through the optical path folding lens set to illuminate the retina. The retina reflects the illumination light to form fundus light. The image sensor receives fundus light through the optical path folding lens set to form a sub-fundus image. The processor stitches all sub-fundus images into a full-fundus image and drives the virtual reality display to display the full fundus image.

A system includes at least a plane semi-reflecting mirror, a light source which is configured to emit a continuous illumination and an event camera to generate events when the object exhibits at least one movement. The plane semi-reflecting mirror is arranged so that it reflects at least the illumination toward the event camera in order to dazzle the camera. The system makes it possible to limit the memory and energy consumption required for monitoring.

An observation apparatus includes: an illumination optical system provided below an installation position of a multi-well plate; a reflector provided above the installation position, the reflector being configured to reflect light emitted from the illumination optical system; and an observation optical system provided below the installation position, the observation optical system being configured to condense the light reflected by the reflector. The reflector is installed such that a marginal ray to enter the observation optical system travels via a peripheral well different from an on-axis well located on an optical axis of the observation optical system before reflection due to the reflector.

This application relates to a method and device for detecting appearance defects using an integrated array optical system, belonging to the field of product appearance defect detection technology. It includes a housing, a lens holder, and a main control module. The lens holder forms a detection chamber, and its inner wall is equipped with multiple arrayed lenses, which, together with a light source cover and a light guide, constitute a uniform reflection illumination system. During detection, the object to be inspected is placed in the detection chamber, and multiple lenses simultaneously acquire multi-angle appearance images of its periphery, bottom, and top. These images are then transmitted to a host computer via the main control module for defect comparison. Through the array lenses and integrated optical design, it can achieve blind-spot-free imaging in a confined space, effectively eliminating specular reflections and shadow interference, and significantly improving the ability to acquire defect features of complex surfaces such as irregular three-dimensional surfaces and inner walls. It also possesses modular customization capabilities, allowing for rapid adaptation to various parts such as lead screws, inverters, and shock absorbers. It offers high detection efficiency and good stability, making it suitable for automated mass production.

A top plate design is described that allows a quick change of the reflector plates, for example, in the top plate assembly.  Using various techniques, the reflector plates or, in some examples, sources of illumination, are held in place by a vacuum during operation.  This technique holds the reflector plates securely without top-side fixturing, maximizing the available active area of a substrate.  A vacuum secures the panel or wafer without contacting the active areas, allowing for non-contact inspection and metrology. The top plate also facilitates the use of interchangeable reflector plates, enabling backlit or reflective illumination of the substrate’s features.

The utility model discloses a reflective unilateral lighting system and a sewing machine in the technical field of sewing machine lighting. The reflective unilateral lighting system comprises a main body assembly, the reflecting plate is arranged on one side of the main body assembly and is fixedly connected with the bottom end of the main body assembly; the soft light cover is arranged below the reflecting plate and is fixedly connected with the main body assembly; the luminous body is arranged between the soft light cover and the reflecting plate; a light-transmitting area is arranged on the soft light cover, and the light-emitting body is located at the end, close to people, of the light-transmitting area. According to the utility model, an asymmetric light path is realized through a reflection illumination mode, the unilateral illumination effect on the bedplate is achieved, a lamplight irradiation area is concentrated in a sewing area, light rays are prevented from directly irradiating eyes, the damage to the eyes is reduced, and the sewing operation efficiency is ensured.

The invention relates to a for controlling a light source, the method using (a) at least one pose estimate of a camera configured to capture one or more images of a scene of interest which comprises at least one landmark, as said light source is operated to emit light which illuminates said scene of interest, (b) a landmark map comprising at least 3D location information of a plurality of landmarks comprising the at least one landmark in the scene of interest, (c) an illumination model describing a relationship between an emission illumination power and a reflection illumination power, wherein said emission illumination power is the power of light emitted by the light source to illuminate said scene of interest, and said reflection illumination power is the illumination power of light reflected by one or more landmarks in said scene of interest and received by the camera, wherein the method comprises the following steps:(1) determining, for at least one of the plurality of landmarks, at least one emission illumination power of light to be emitted by the light source, and an illumination time during which the light source should be operated to emit light which has an emission illumination power which is equal to the at least one emission illumination power, using (i) the at least one pose estimate of the camera, (ii) the 3D location information of the at least one of the plurality of landmarks, (iii) the illumination model; and (2) operating the light source to emit light which has an emission illumination power which is equal to the at least one emission illumination power, for a time period which is equal to the determined illumination time course; and (3) updating the illumination model parameters, wherein the illumination model parameters which are updated comprise reflectivity parameters of at least one landmark.

Devices, methods, and systems related to surgical microscopes using red reflected illumination are provided. According to one aspect of the present invention, there is a red reflective surgical microscope system that may have a red reflective illumination source, an objective lens, and an aperture stop. In some embodiments, an aperture stop is located between the illumination source and the objective lens. An image of the aperture stop may be imaged near the objective lens, and a size of a light beam reflected from the objective lens is shortened based on a proximity of the image of the aperture stop to the objective lens. Other embodiments described herein include a red reflective surgical microscope system for use in conjunction with OCT and coupled via a dichroic mirror in which an obstacle is configured to minimize glare by being positioned on or adjacent a side of the dichroic mirror that does not reflect OCT light. Other embodiments include a tilted white light illumination source. Additional embodiments are also described herein.

The application discloses a kind of comprehensive microscopic measurement system and its measurement method of multi-parameter synchronous measurement, solve the measurement mode single of existing microscopic measurement system, cannot realize the demand of in-situ measurement multiple optical parameters problem, specifically including objective table, transmission illumination module, imaging module and reflection illumination module;Objective table is used to carry the sample piece to be measured;Transmission illumination module is set below objective table, to emit transmission measurement light to the sample piece to be measured on objective table;Reflection illumination module is set in the side of objective table, for emitting reflection measurement light;Imaging module is set above objective table, for receiving transmission measurement light or reflection measurement light, to measure corresponding parameter.The comprehensive microscopic measurement system and its measurement method can realize the imaging of light-transmitting / non-light-transmitting sample piece, three-dimensional topography, phase modulation quantity, polarization modulation quantity and other physical measurements, meet multiple measurement requirements, significantly improve measurement efficiency and multifunctionality.

An in-chamber device and method for calibrating a tunable-focus camera system may include an optical chamber that includes a housing, camera sensor, camera receiving lens, and illumination source. The housing may define an aperture, and the camera sensor may be disposed within the housing. The camera receiving lens may be disposed in the aperture and configured to enable light external of the optical chamber to be focused onto the camera sensor. The illumination source may be configured to output an illumination signal that is incident the camera receiving lens along a first axis via the camera receiving lens. The illumination signal may be reflected from a reflective element as a reflected illumination signal back through a second axis via the camera receiving lens so as to enable the reflected illumination signal to be sensed. The optical chamber may be used to automatically calibrate the tunable-focus camera system periodically or aperiodically.

The utility model discloses an electric bicycle headlight which is characterized in that a reflecting lamp cup is arranged inside a barrel cavity, a lens is fixed at a front-end barrel opening of a lamp barrel, a ring is fixedly connected with the outer wall of the front-end barrel opening of the lamp barrel, the inner wall of a cavity opening of the barrel cavity is fixedly connected with the reflecting lamp cup, and the reflecting lamp cup is integrally formed; the reflecting lamp cup comprises a central funnel-shaped light reflecting cup and a V-shaped outer ring reflecting cup, and a central funnel-shaped light reflecting cavity and a V-shaped outer ring reflecting cavity are correspondingly formed in the reflecting lamp cup; the V-shaped outer ring reflection cavity surrounds the central funnel-shaped light reflection cavity; a central main illumination LED lamp is fixed in the center of the bottom of the central funnel-shaped light reflection cavity; an outer ring auxiliary lighting LED lamp is fixed to the bottom of the V-shaped outer ring reflection cavity in a surrounding mode. The central funnel-shaped light reflection cavity and the V-shaped outer ring reflection cavity of the product are independent from each other to form a double-cavity reflection cup, optical crosstalk is avoided, light source reflection between external light irradiation does not influence each other, and the reflection illumination effect of the central main illumination LED lamp and the outer ring auxiliary illumination LED lamp is good.

Imagining using reflected illuminated structures (“IRIS”) in accordance with embodiments of the invention are disclosed. In one embodiment, an IRIS device is provided, the IRIS device comprising: a projector; a camera; a processor operatively connected to the projector and the camera; and a memory storing instructions that, when executed by the processor, cause the image capture device to: project, using the projector, a plurality of illuminated structures onto an object having an optically transparent, translucent, or opaque surface; and capture, using the camera, image data comprising a reflection of the plurality of illuminated structures from the optically transparent, translucent, or opaque surface of the object.

The invention belongs to the technical field of optical imaging focusing control, and particularly relates to a focusing control method and system based on a light spot shape, and the system comprises a light source assembly, a condensation assembly, a light spot regulation and control assembly, a light detector, a displacement adjustment assembly, and a computer processing assembly. The method comprises the following steps: regulating and controlling a light spot generated by reflecting an illumination light beam by a sample, imaging the light spot by using a light detector to obtain light spot shape information, and obtaining the focusing state of the sample based on light spot shape characteristics; the position of the sample is adjusted according to the focusing state of the sample, and automatic focusing is realized by a focusing servo system. Based on the detection of the light spot shape, the adverse effect of the light spot position offset and the brightness change on the automatic focusing can be eliminated, so that the method is higher in applicability and higher in reliability in different application scenes.

Camera device (10) for producing at least one image of at least one object (O1, O2) in an environment (U), comprising: - a light-guiding medium (23) comprising a first deflection element (21) and a second deflection element (22) and configured to transmit light by means of internal reflection between the first and second deflection elements (21, 22), - a lighting device (30) configured to provide an illumination light (31) for illuminating the object (O1, O2) in the environment (U), an image acquisition device (40) configured to capture the reflected illumination light (41) upon reflection of the illumination light (31) at the respective object (O1, O2) and to generate at least one image, wherein, for the purpose of providing the reflected illumination light (41) to the image acquisition device (40), the first deflection element (21) is configured to couple the reflected illumination light (41) into the light-guiding medium (23) for transmission to the second deflection element (22), and the second deflection element (22) is configured to couple the transmitted illumination light (41) out of the light-guiding medium (23) for transmission to the image acquisition device (40),wherein the image acquisition device (40) is attached directly to a first side of the light guiding medium (23) within an area formed by a decoupling deflection structure (222) of the second deflection element (22), - a control device (50) configured to operate the lighting device (30) and the image acquisition device (40) in a predetermined switching operation, wherein the lighting device (30) and the image acquisition device (40) have an activated state for providing the illumination light (31) and for capturing the reflected illumination light (41) in the switching operation at different times from each other, characterized in that the lighting device (30) is configured to provide the illumination light (31) to the second deflection element (22), wherein the second deflection element (22) is configured to couple the illumination light (31) into the light-guiding medium (23) for transmission to the first deflection element (21), and the first deflection element (21) is configured to couple the transmitted illumination light (31) out of the light-guiding medium (23) for illumination of the object,wherein the illumination device (30) is attached directly to the first side of the light guiding medium (23) within an area formed by a coupling deflection structure (221) of the second deflection element (22), and that the first deflection element (21) and the second deflection element (22) are configured to compensate for a distance between the image acquisition device (40) and the illumination device (30).

This application relates to the field of visual inspection technology, specifically to a reflective illumination device and a curved surface inspection system, which can, to some extent, solve the problem of inconsistent illumination brightness on curved surfaces caused by illumination devices. This application provides a reflective illumination device and a curved surface inspection system. The curved surface inspection system includes a camera and a reflective illumination device. The reflective illumination device includes a coaxial light source and at least one reflector mechanism. The coaxial light source provides coaxial light to the test object, which includes a curved surface. The reflector mechanism facing the curved surface includes a plane reflector and an aspherical reflector. One end of the aspherical reflector is connected to one end of the plane reflector. The plane reflector and the aspherical reflector are used to supplement the illumination of the curved surface. By supplementing the illumination of the curved surface through the reflector mechanism, the illumination distribution of the curved surface is made more uniform, improving the uniformity of the image of the curved surface and further improving the inspection effect of the curved surface.

The present application relates to the technical field of near-eye display, in particular to a micro double-prism projection system for reflecting illumination light source and a near-eye display device. The micro double-prism projection system comprises an illumination light source, an image source, a first prism and a second prism, the second prism is arranged between the first prism and the image source; the second prism is used for receiving the illumination light ray output by the illumination light source and reflecting the illumination light ray twice to the image source; the image source forms an image light ray after reflecting the illumination light ray, the image light ray is refracted by the second prism and then enters the first prism, and after twice reflection in the first prism, the image light ray is shot to an exit pupil position. In the present application, the illumination light path and the imaging light path share the second prism, the illumination light ray is shot to the image source after twice reflection by the second prism, the image light ray is refracted by the second prism, then realizes twice reflection by the first prism, and then is shot to the exit pupil position, realizing light path folding and greatly reducing the volume of the projection system.

The invention discloses a high-flux wide-spectrum microscopic diffuse reflection illumination system, which comprises a multiband LED (Light Emitting Diode) light emitting module, an aspheric collimating lens group, a beam combining optical array, an achromatic lens and an output multimode optical fiber, and is characterized in that the multiband LED light emitting module comprises at least three high-power LED units with complementary central wavelengths; the aspheric collimating lens group converts divergent light beams of the LED unit into collimated light beams, the beam combining optical array realizes spatial coaxiality of all the collimated light beams through the dichroscope and combines the collimated light beams into composite full-spectrum collimated light beams, and the achromatic lens focuses the composite full-spectrum collimated light beams on the same focal plane. And the output multimode optical fiber receives the focused composite full-spectrum collimated light beam and serves as a cold light source input end of the microspectrometer. An LED pure cold light source is adopted, infrared heat radiation is avoided, and sample heat damage and catalyst inactivation can be avoided; meanwhile, aspherical collimation, dichroscope beam combination and achromatic coupling are adopted, and high-power output of the wave band of 380-830 nm is achieved.

The table lamp comprises a base, a lamp pole, a night lamp body and a table lamp body, the lamp pole is connected between the base and the night lamp body, a night lamp connecting boss protruding out of the light-emitting end face is arranged on the light-emitting end face of the night lamp body, and the table lamp body is arranged on the lower side of the light-emitting end face of the night lamp body. The lamp body buckling assembly is arranged between the table lamp body and the night lamp connecting boss, the lamplight reflecting piece for reflecting the night lamp lamplight is arranged on the top face of the table lamp body, a user cannot directly see a night lamp light source, therefore, the problem that eyes are stimulated to cause discomfort is avoided, illumination lamplight is reflected through the lamplight reflecting piece, and the illumination range is enlarged.

The application relates to the technical field of line-of-sight tracking and discloses a classroom teacher behavior space-time feature fusion tracking method, which comprises the following steps: acquiring a pupil corneal reflection difference signal of teacher eye movement, locking an alias frequency according to aliasing relationship between a classroom lighting modulation frequency and an eye movement sampling rate; calculating a whiteboard glare coefficient of the signal at the frequency, quantifying phase distortion generated by whiteboard mirror reflection, lighting stroboscopic and rolling shutter coupling; analyzing the coefficient into an effective time dislocation between axes, implementing fractional delay phase equalization on an image line scanning axis component of the signal, generating a deskewing vector, and finally calculating a gaze point on a whiteboard plane based on the vector. The application can accurately remove classroom-specific optical-sampling composite noise, effectively suppress abnormal jitter of the line-of-sight signal, and significantly improve the positioning accuracy and stability of teacher board writing behavior monitoring.

An imaging system includes a housing, a light splitting element, a light valve module, and a compensation module. The light valve module is configured in a transmission path of an illumination light beam for converting the illumination light beam into an image light beam. The light splitting element is configured in the transmission path of the illumination light beam for reflecting the illumination light beam and allowing the image light beam to pass through. The compensation module is configured between the light valve module and the light splitting element. The compensation module includes a carrier element and a compensation element. The carrier element includes a placement slot. The carrier element is configured to rotate around a rotation axis. The compensation element is configured in the placement slot and located in the transmission path of the illumination light beam and the image light beam, which can improve the convenience and accuracy of adjusting the angle of the compensation element.

The present invention provides a device of photocatalytic redox reaction based on structured light illumination, comprising: a computer module, sending control instructions to structured light generation module and image acquisition module, to control generations of structured illumination field and total internal reflection illumination field, and acquisition of images of single-molecule fluorescence; the structured light generation module, comprising lasers, an acousto-optic tunable filter (AOTF) and a spatial light modulator (SLM), and controlling the lasers, the AOTF and the SLM to generate and regulate the structured illumination field for exciting a photocatalytic redox reaction, and generate and regulate the total internal reflection illumination field for exciting the single-molecule fluorescence; and, the image acquisition module, acquiring images of fluorescence signals in a process of the photocatalytic redox reaction.

The utility model relates to a zero-degree coaxial LED red light reflection device of an ophthalmologic operation microscope. A red light reflection light axis is arranged on a preset axis of a microscopic primary mirror; a microscope objective lens is arranged below the microscope primary mirror along the red light reflecting light axis; a miniature coaxial LED red light reflecting device is arranged between the microscope primary mirror and the microscope objective lens along a red light reflecting light axis; therefore, the generated light is coaxially irradiated with the microscopic primary mirror and the red light reflection light axis, and coaxial red light reflection illumination light is realized. The lens can be embedded between the left optical axis and the right optical axis of the primary mirror; a built-in integrated microscope is used for control; the zero-degree coaxial LED illumination light with an independent light source is high in illumination brightness and uniform in light spot, observation of a microscope is not affected, the zero-degree coaxial incident angle LED illumination light which is bright enough is achieved, and strong red light reflection is obtained. The device and the microscope are integrally controlled, the integrity of the microscope is realized, and the function of the microscope is improved.

The invention relates to the technical field of sight tracking, and discloses a classroom teacher behavior spatio-temporal feature fusion tracking method, which comprises the following steps: acquiring pupil and cornea reflection difference signals of teacher eye movement, and locking alias frequency according to an aliasing relationship between classroom illumination modulation frequency and eye movement sampling rate; calculating a whiteboard glare coefficient of the signal at the frequency, and quantifying phase distortion generated by whiteboard mirror reflection, illumination stroboflash and rolling shutter coupling; the coefficient is analyzed into inter-axis effective time dislocation, fractional delay phase equalization is carried out on image line scanning axis components of the signals, and a skew-free vector is generated; and finally, resolving the fixation point on the whiteboard plane based on the vector. According to the invention, the special optical-sampling composite noise of the classroom is accurately eliminated, the abnormal jitter of the sight line signal is effectively inhibited, and the positioning precision and stability of the blackboard writing behavior monitoring of the teacher are remarkably improved.

The present invention provides a new type of automobile panoramic sunroof, which includes an automobile sunroof mounting frame, on which an automobile sunroof assembly is mounted. The automobile sunroof assembly includes three layers: a top layer of seamless cover plate painted the same as the vehicle body, a middle layer of louvered solar panels, and a bottom layer of laminated light-transmitting glass panels. The new automobile panoramic sunroof of the present invention adopts a three-layer structure. The panoramic sunroof is modified to be able to collect energy through the louvered solar panels and use it for scattered / reflected lighting of the laminated glass panels, thereby achieving multifunctionality of the panoramic sunroof. The arc-shaped expansion and contraction of the top cover plate is beneficial for protecting the solar panels and laminated glass panels on the inner layer. The independent linkage of each layer realizes the functional operation of each layer, ensuring the normal operation of the panoramic sunroof. The scattered / reflected lighting of the laminated glass panels reduces the energy consumption of the vehicle and improves the lighting effect in the vehicle cabin. The multifunctional panoramic sunroof has excellent market application value and prospects.

The utility model discloses a layout type landscape lawn lamp which comprises a lamp holder and a lighting lamp, the area, perpendicular to the ground, of the inner wall of the lamp holder is a rain shielding area, and the lighting lamp is installed at the top of the rain shielding area of the inner wall of the lamp holder. The lamp further comprises an upper light reflecting part and a lower light reflecting part, and the upper light reflecting part and the lower light reflecting part are used for reflecting a plurality of light rays of the illuminating lamp in multiple directions. The upper light reflecting part is arranged on the upper portion of the rain sheltering area of the lamp holder, and the lower light reflecting part is arranged under the illuminating lamp and located in the rain sheltering area in the lamp holder. The upper reflecting part is arranged on the upper portion of the inner wall of the lamp holder and on the periphery of the illuminating lamp, the lower reflecting part is arranged under the illuminating lamp, and the upper reflecting part and the lower reflecting part reflect a plurality of light rays of the illuminating lamp in multiple directions. Light, blocked by the lamp holder, of the illuminating lamp is reflected by the upper reflecting part, the illuminating efficiency is improved, the light utilization rate is increased, and the illuminating area at night is enlarged.

To provide a simple and compact configuration that is tolerant to deviations in angle θ and working distance D. [Solution] The device is configured to include a light source unit that splits laser light into two to generate illumination light and local light, an interference light detection unit that has a photodetector and irradiates a measurement object with the illumination light, causes the measurement light generated by reflection of the illumination light from the measurement object to interfere with the local light to generate interference light, receives the interference light with the photodetector, and generates an interference signal, which is an electrical signal, and a signal processing unit that acquires information about the vibration of the measurement object from the interference signal. At the light receiving surface of the photodetector, the beam diameter of the local light that constitutes the interference light is larger than the light receiving diameter of the photodetector, and the beam diameter of the measurement light that constitutes the interference light is sufficiently smaller than the light receiving diameter of the photodetector.

A method comprising: activating a strobed or pulsed illumination source to produce illuminating light; polarising the illuminating light in a first polarisation axis; illuminating at least part of a tall plant crop with the polarised illuminating light to produce reflected illuminating light; polarising the reflected illuminating light in a second polarisation axis transverse to the first polarisation axis to produce cross-polarised reflected illuminating light; capturing an image of at least part of the tall plant crop using the cross-polarised reflected illuminating light; and analysing the captured image to determine a condition of the tall plant crop. Also a vehicle mounted image capture system, a vehicle mounted spraying system and a plant health management system.

The invention relates to a method for controlling a light source (7), the method using (a) at least one pose estimate (1) of a camera (8) configured to capture one or more images of a scene of interest (13) which comprises at least one landmark (9), as said light source is operated to emit light which illuminates said scene of interest, (b) a landmark map (2) comprising at least 3D location information of a plurality of landmarks comprising the at least one landmark in the scene of interest, (c) an illumination model (3) describing a relationship between an emission illumination power and reflection illumination power, wherein said emission illumination power is the power of light emitted by the light source (7) to illuminate said scene of interest, and said reflection illumination power is the illumination power of light reflected by one or more landmarks in said scene of interest and received by the camera, and (d) a predefined threshold reflection illumination power (4). The method comprises the following steps: (a) determining (5), for at least one of the plurality of landmarks, at least one optimized emission illumination power of light (6) to be emitted by the light source, and an illumination time course (6) during which the light source should be operated to emit light which has an emission illumination power which is equal to the at least one optimized emission illumination power, using (i) the at least one pose estimate (1) of the camera, (ii) the 3D location information of the at least one of the plurality of landmarks, (iii) the illumination model (3), and (iv) the predefined threshold reflection illumination power (4); and (b) operating the light source (7) to emit light which has an emission illumination power which is equal to the at least one optimized emission illumination power (6), for a time period which is equal to the determined illumination time course (6).

This utility model belongs to the field of lighting technology and discloses a diffuse reflection lighting device. Both the first and second light-blocking sections are provided with diffuse reflection layers. Direct light emitted by the lighting unit located in the installation space can be effectively intercepted by the adjacent sides of the first and second light-blocking sections, preventing direct light from illuminating the object to be illuminated below the main body of the device and causing localized overexposure or directional shadows. Furthermore, after the direct light reaches the adjacent sides of the first and second light-blocking sections, it forms diffuse reflection light under the action of the diffuse reflection layers, enhancing the uniformity of illumination on the object to be illuminated, improving the overall illumination effect of the lighting unit on the object to be illuminated, and ensuring the accuracy of subsequent visual inspection operations on the object to be illuminated. The diffuse reflection lighting device only provides diffuse reflection layers on the first and second light-blocking sections, shortening the reflection path and reducing the cost of reflection, thereby reducing the overall manufacturing cost of the light-blocking unit and decreasing the light loss rate.

An inspection device improves accuracy characteristics of an (MRAM), the inspection device including a stage on which a MRAM element is fixed, and electromagnets generating a first magnetic field. A magnetic field having a component in a direction perpendicular to the stage is changeable from a first direction to a second direction according to a position on the stage. A second magnetic field in which a direction of a magnetic field component is parallel to the stage changes from a third direction to a fourth direction according to the position on the stage, an optical system illuminating the MRAM element with light including polarized light, and condensing reflected light from reflected illumination light from the MRAM element, and a detector detecting reflected light when the position of the MRAM element is changed, and when the position of the MRAM element in the second magnetic field is changed.