201128163 六、發明說明： 【發明所屬之技術領域】 本發明係關於螺紋峰的檢查裝置。尤其，關於發現形 成於公螺絲的螺紋峰之凹凸的檢查裝置。 【先前技術】 車輛的引擎或暖氣用具所使用之火星塞係根據交換作 業的谷易性而具有螺絲構造。又’平台的位置調整所使用 之滾珠螺絲（b a 11 s c r e w )也使用螺絲構造。但是，在螺 紋峰損壞而有凹凸時，會無法確實螺合公螺絲與母螺絲， 或者即使可以螺合，也無法卸下。爲此，該等螺絲係於其 製造工程中，進行螺紋峰是否被擠壓損傷，或者是否在允 許範圍內的形狀檢查。 作爲檢查螺紋峰之形狀的裝置，例如，於專利文獻1 揭示有對於螺紋峰，從一方側部照明光而於相反側側部中 將所得到之透過光加以攝像的裝置。放射光係於螺紋峰的 部份中被遮光而成爲剪影，又，檢測山谷部份的透過光而 掌握螺絲的形狀者。然而，此種裝置係可檢測某種的形狀 不良，但是，依據變形的程度也有無法辨識不良之狀況。 圖6係揭示用以說明先前之檢查裝置的原理的模式構 造。（a )〜（d )係檢查對象物的形狀分別不同，（a 1 ) 〜（d 1 )係揭示挾持檢查對象物而於左配置光源，於右配 置影像感測器的構造。（a2 )〜（d2 )係揭示從光源側觀 看檢查對象物之狀態。檢查對象物係在說明的便利上，以 -5- 201128163 三角形的板材作爲基本。 (a)係揭示檢查對象物是正常狀態。來自光源的放 射光因檢查對象物而一部份被遮光，藉由不被遮光而到達 影像感測器爲止的光，辨識檢查對象物的形狀》 (b )係揭示檢查對象物的頂點爲欠缺之狀態。此時 ’來自光源的放射光在欠缺部份並不被遮光，故影像感測 器可辨識（b2 )所示之形狀。然後，可利用與預先記憶之 正常圖案進行比較來檢測形狀缺陷。 (c )也與（b )相同是揭示檢查對象物變形之狀態， 檢查對象物的頂點被擠壓而形成毛邊之狀態。此時，影像 感測器也將毛邊作爲遮光部份來辨識。 (d )係揭示於檢查對象物之光源側的側部形成凹凸 之狀態。此時，檢査對象物的整體形狀係與正常圖案相同 ，故影像感測器無法檢測凹凸之有無。 如此，於對於從光源朝向影像感測器的光路徑交叉之 方向中產生形狀變化時，影像感測器雖然可檢測出其形狀 變化，但是，在沿著從光源朝向影像感測器的光路徑之行 進方向而產生形狀變化時，因爲不會影響遮光區域，故結 果無法檢測出形狀變化。 又，於專利文獻2及專利文獻3係揭示從螺紋峰的側部 照明光，感測其反射光的構造。但是，雖然此種裝置也可 辨識螺紋峰之有無或變形之有無，但是，並無法正確辨識 是何種變形。又，於螺紋峰的一部份產生凹凸時，會將該 當凹凸的反射光加以受光。 -6- 201128163 亦即’先前所知的檢查裝置係雖然可檢測出某種不良 品’但是，也有依據形狀變化的程度而無法辨識不良之狀 況，有無法進行高精度的檢測之問題。 不過，雖然使用多數光源，利用從複數角度花費時間 來照射光也可提升檢測精度，但是，螺絲本來就是較小的 東西，高感度檢測因螺紋峰的變形而產生之凹凸並不容易 [先前技術文獻] [專利文獻] [專利文獻1]日本特開昭62-49203號公報 [專利文獻2]日本特開平5-240738號公報 [專利文獻3 ]日本特開昭5 5 - 7 0 7 0 2號公報 【發明內容】 [發明所欲解決之課題] 此發明係提供不管螺紋峰如何變形也可良好地辨識的 檢查裝置。 [用以解決課題之手段] 爲了解決前述課題，關於此發明之螺紋峰的檢查裝置 ’係於具有部份且連續照明旋轉之螺絲的外表面之光源部 '將來自螺絲的反射光加以受光之攝像感測器及依據螺絲 的旋轉資訊與攝像資訊來辨識螺紋峰的形狀之畫像處理部 201128163 的構造中，其特徵爲：前述攝像感測器，係在螺紋 正常時，不會辨識前述反射光，但是，僅在螺紋峰 希望之凹凸時，至少觀察可將起因於該當凹凸之反 以受光的區域。 進而，特徵爲前述光源部係形成有兩個，對於 域，從螺絲之旋轉方向的前方與後方來照明該當螺 進而，特徵爲前述光源部，係放射波長分別不 [發明的效果] 關於此發明之螺紋峰的檢查裝置，係因爲僅在 形成有凹凸時，於將來自螺絲表面的反射光加以受 置，配置攝像感測器，故可確實檢測形成於螺絲的 進而，利用設置放射不同波長的光之兩個光源，可 像畫像的濃淡或演色特性而更正確掌握凹凸的形狀 【實施方式】 圖1係揭示關於本發明之螺紋峰檢査裝置的槪 。身爲檢查對象的螺絲係被安裝於保持台1的旋轉 螺絲係藉由旋轉部1 a，旋轉於圖示的方向，亦即， 與母螺絲螺合時的方向。來自光源2 (2a，2b)的 係通過擴散板3 ( 3a，3b )而照明螺絲的外表面。 散板3 ( 3a，3b )的存在，可照明公螺絲的長度方 域。再者，公螺絲的長度係例如2〜3 m m程度。又 省略後述之鏡頭、攝像感測器、畫像處理部。 峰形狀 存在不 射光加 前述區 紋峰。 同。 螺紋峰 光之位 凹凸。 根據攝 略構造 部la。 旋轉於 放射光 藉由擴 向全區 ，圖1係 -8- 201128163 圖2係表示從上方眺望圖丨所示之檢查裝置的狀態。光 源2a與光源2b及擴散板33與擴散板3b係挾持連接螺絲、鏡 頭4、攝像感測器4的虛擬線A而配置爲線對稱。從擴散板 3 a放射之光L 1 a與光L 2 a係在螺絲外表面被反射而經由鏡頭 4射入攝像感測器5。同樣地，從擴散板3b放射之光Llb與 光L2b係在螺絲外表面被反射而經由鏡頭4射入攝像感測器 5 °攝像感測器5的輸入資訊係被發送至畫像處理部6，在 畫像處理部6係可依據來自攝像感測器4的光資訊與來自保 持台1的旋轉資訊，辨識螺絲全周面的形狀。再者，攝像 感測器5係使用具有對應螺絲大小之面積的區域感測器。 鏡頭4係擷取光源2 a的放射光中螺絲外表面的區域a之 反射光’與光源2 b的放射光中螺絲外表面的區域b之反射 光。光源2 ( 2a ’ 2b )的放射光係通過擴散板3 ( 3a，3b ) ’也照明前述區域（區域a，區域b )以外的螺絲外表面區 域（例如’區域c )。但是，該等照明光係因射入角度的 關係’不會被鏡頭4擷取。所以，如果螺紋峰的形狀正常 的話’僅前述區域a與區域b之螺絲形狀會在攝像感測器5 受光。. 圖3係表示用以針對螺紋峰的形狀正常時之光源與鏡 頭之間的光路徑加以說明的圖。再者，於紙面垂直方向， 連續形成螺絲的峰與谷，但是，圖爲了揭示將螺絲橫切之 狀態，未表示螺紋峰的形狀。 於圖中’光源2a的放射光’且通過擴散板3a的光li a 照射螺絲外表面的位置p〗a，與光L2 a照射螺絲外表面的位 -9 * 201128163 置P2a之間所形成之區域（區域a )之反射光被鏡頭4擷取 。同樣地，光源2b的放射光，且通過擴散板3b的光Lib照 射螺絲外表面的位置P 1 b，與光L2b照射螺絲外表面的位置 P2b之間所形成之區域（區域b )之反射光也被鏡頭4擷取 。另一方面，例如如光L3 a，照射離開區域a之區域（區域 c )時，其反射光不被鏡頭4擷取。所以，圖示省略的攝像 感測器係對於旋轉之螺絲，同時辨識來自區域a的反射光 與來自區域b的反射光，但是，並不會辨識區域c之反射光 。再者，關於螺絲的長度方向（旋轉螺絲時螺絲行進之方 向），可藉由擴散板3 ( 3a，3b )同時照明螺紋峰的全部 區域。爲此，至少使螺絲旋轉1圏時，畫像處理部6係可掌 握螺紋峰部份全部區域的形狀。 圖4係表示用以針對螺紋峰的形狀不正常，而其一部 份存在不希望之凹凸時之光源與鏡頭之間的光路徑加以說 明的圖。與圖3相同，區域a之反射光與區域b之反射光係 被鏡頭4擷取而於攝像感測器5中被受光。另一方面，光源 2a側的光L3 a係於區域c中於凹凸的壁面H1被反射，其反射 光也被鏡頭4擷取。進而，光源2b側的光L3b係於區域c中 於凹凸的壁面H2被反射，其反射光也同樣被鏡頭4擷取。 亦即，如果螺紋峰的形狀正常的話，區域c之反射光係因 爲照明光的入射角度之關係，不會被鏡頭4擷取，但是， 如螺紋峰存在有不希望之凹凸的話，該當凹凸的壁面之反 射光則會被鏡頭4擷取。此爲本發明的特徵。 進而，在本發明中，可藉由光源2a的放射光來照射凹 -10- 201128163 凸的壁面HI，可藉由光源2b的放射光來照射凹凸的壁面 H2。如此利用將兩個光源以檢查對象爲中心而配置於正 相反的方向，可同時檢測出壁面Η 1與壁面H2的反射光， 結果，可更正確檢測出凹凸形狀。如更進一步說明的話， 因爲螺絲正在旋轉，故雖然在凹凸位於區域a或區域b時可 藉由反射光來辨識任何異狀，但是，因爲是對於凹凸之來 自一方向的照明，故如圖6所說明，並無法正確辨識凹凸 〇 圖5係揭示攝像感測器5 (區域感測器）所致之受光狀 態。揭示正在旋轉之螺絲的某瞬間之狀態。（a )係揭示 對應圖3者且螺紋峰的形狀正常之狀況，（b )係揭示對應 圖4者，且於螺紋峰的一部份形成不希望之凹凸之狀況。 於（a )中，攝像感測器5係將依據光源2 a的區域a之 反射光’與依據光源2b的區域b之反射光加以受光，但是 ，來自區域c的反射光並未受光。爲此，區域c所對應之區 域係並未辨識任何畫像。另一方面，於（b )中，攝像感 測器5係將依據光源2 a的區域a之反射光，與依據光源2 b的 區域b之反射光與（a )同樣受光，但是，即使在區域c， 也將來自凹凸之壁面的反射光加以受光。 如此，本發明係利用攝像感測器5本來進行受光來檢 測來自區域的反射光，可檢測出螺紋峰的凹凸。 光源2係放射可視光者，例如可採用LED。又，於圖1 及圖2中，光源2a與光源2b係分別放射不同波長的光（不 同顔色的光）爲佳。例如，例如光源2 a使用放射紅色的光 -11 - 201128163 之LED，光源2b使用放射藍色的光之LED。此優點係因爲 對於1個凹凸，可利用藉由使一方的光源之光反射之壁面 與另一方的光源之光反射之壁面成爲分別不同之濃淡、顏 色特性來檢測畫像，可更明確特定該當凹凸的外觀形狀。 例如，圖5 ( b )之狀況，紅色畫像G 1與藍色畫像G2被辨 識時，紅色與藍色的組合部份爲一個凹凸，從紅色與藍色 的方向也可進行凹凸的區別。又，可判斷以該等畫像的包 絡線連接之部份爲凹凸的大小。進而，也可進行與接近產 生之凹凸的區別。但是，假如光源2a與光源2b相同的話， 畫像G1與畫像G2被辨識爲相同圖案，並且存在於其附近 之畫像G3也同樣被辨識，會難以特定凹凸是藉由哪個畫 像的組合而形成。如此，本發明的特徵也爲分別從相反方 向來照明不同波長的光（不同顏色的光）。 攝像感測器係可將彩色畫像加以攝影的CCD攝像機爲 佳。又，利用調整鏡頭，可調整與螺紋峰的距離及焦點。 進而，在前述實施例中，作爲攝像感測器，已使用區域感 測器來進行說明，但是，作爲線感測器亦可。此時，利用 僅將區域c作爲受光區域，使用線感測器，也可發揮相同 的作用效果。 擴散板3係例如由丙烯酸樹脂板等所成。利用使對螺 絲的照明光擴散，可進行來自所有方向的照明。藉此，可 更高精度檢測出凹凸。 在前述實施例中，已針對光源2與擴散板3被固定，可 同時照明螺絲的全長之狀況加以說明，但是，例如，於螺 •12- 201128163 絲的全長較長之狀況中，也可爲光源2與擴散板3—體移動 於螺絲的全長方向，伴隨移動而照明螺絲外表面。 再者’前述圖1、圖2、圖3、圖4係在爲了說明發明的 便利上，極其模式化來表現。爲此，入射角、反射角等之 角度及方向係在光學上不一定爲正確記載。又，螺絲也僅 表現螺紋峰、谷的部份’但是，實際上存在螺絲的頭及身 體部。 【圖式簡單說明】 [圖1 ]揭示關於本發明之螺紋峰的檢查裝置的槪略構 造。 [圖2 ]揭示關於本發明之螺紋峰的檢查方法的槪略構 造。 [圖3 ]揭示關於本發明之螺紋峰的檢查方法的槪略構 造。 [圖4 ]揭示關於本發明之螺紋峰的檢查方法的槪略構 造。 [圖5 ]揭示用以說明關於本發明之螺紋峰的檢查裝置 的槪念圖。 [圖6]揭示用以說明先前之螺紋峰的檢查裝置的圖。 【主要元件符號說明】 1 :保持台 2 :光源 -13- 201128163 3 :擴散板 4 :鏡頭 5 :攝像感測器 6 :畫像處理部 -14 -201128163 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to an inspection apparatus for a thread peak. In particular, an inspection apparatus for finding the unevenness of the thread peak formed in the male screw is found. [Prior Art] The Mars plug used in the engine or the heating appliance of the vehicle has a screw structure according to the workability of the exchange work. Also, the ball screw (b a 11 s c r e w ) used for the position adjustment of the platform is also constructed using a screw. However, when the thread peak is damaged and there is unevenness, the male screw and the female screw cannot be screwed, or they cannot be removed even if they can be screwed. For this purpose, the screws are used in their manufacturing work to determine if the thread peaks are crushed or if they are within the allowable range. As an apparatus for inspecting the shape of the thread peak, for example, Patent Document 1 discloses a device for illuminating light from one side portion and imaging the obtained transmitted light in the opposite side portion with respect to the thread peak. The emitted light is shaded in the portion of the thread peak to become a silhouette, and the shape of the screw is detected by detecting the transmitted light in the valley portion. However, such a device can detect a certain shape defect, but depending on the degree of deformation, there is an unrecognizable condition. Fig. 6 is a view showing a mode configuration for explaining the principle of the prior inspection apparatus. (a) to (d) are different in shape of the object to be inspected, and (a1) to (d1) disclose the structure in which the light source is disposed on the left side and the image sensor is disposed on the right side. (a2) to (d2) reveal the state of the inspection object viewed from the light source side. The object to be inspected is convenient for the description, and the plate of -5-201128163 is used as the basic. (a) reveals that the object to be inspected is in a normal state. The emitted light from the light source is partially blocked by the inspection object, and the shape of the inspection object is recognized by the light that has not been blocked by the image sensor, and (b) reveals that the apex of the inspection object is missing. State. At this time, the emitted light from the light source is not shielded from light in the missing portion, so the image sensor can recognize the shape shown in (b2). Shape defects can then be detected using a comparison with a pre-memorized normal pattern. (c) Similarly to (b), the state in which the object to be inspected is deformed is revealed, and the apex of the object to be inspected is pressed to form a burr. At this time, the image sensor also recognizes the burr as a shading portion. (d) A state in which irregularities are formed on the side of the light source side of the inspection object. At this time, the overall shape of the inspection object is the same as the normal pattern, so the image sensor cannot detect the presence or absence of the unevenness. In this way, when a shape change occurs in a direction in which the light path from the light source toward the image sensor intersects, the image sensor can detect the shape change, but along the light path from the light source toward the image sensor. When the shape is changed in the traveling direction, since the light-shielding region is not affected, the shape change cannot be detected as a result. Further, Patent Document 2 and Patent Document 3 disclose a structure for illuminating light from a side portion of a thread peak and sensing the reflected light. However, although such a device can recognize the presence or absence of a thread peak or the presence or absence of deformation, it does not correctly identify the deformation. Further, when irregularities are generated in a part of the thread peak, the reflected light of the unevenness is received. -6- 201128163 That is, the above-mentioned inspection apparatus is capable of detecting a certain defective product. However, there is a problem that the defect cannot be recognized depending on the degree of shape change, and there is a problem that high-precision detection cannot be performed. However, although most light sources are used, it takes a lot of time to illuminate the light from a complex angle to improve the detection accuracy. However, the screw is originally a small thing, and the high-sensitivity detection is not easy due to the deformation of the thread peak [Previous technique] [Patent Document 1] [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei No. 5-240738 [Patent Document 3] Japanese Patent Laid-Open No. 5 5 - 7 0 7 0 2 SUMMARY OF THE INVENTION [Problem to be Solved by the Invention] This invention provides an inspection apparatus that can be well recognized regardless of how the thread peak is deformed. [Means for Solving the Problem] In order to solve the above-described problems, the inspection device for the thread peak of the present invention is based on a light source portion of the outer surface of a screw having a partial and continuous illumination rotation, and receives the reflected light from the screw. In the structure of the image processing unit 201128163 which recognizes the shape of the thread peak based on the rotation information of the screw and the imaging information, the image sensor is characterized in that the reflected light is not recognized when the thread is normal. However, at least when the concave and convex portions of the thread peak are desired, at least the region which is caused by the opposite of the concave and convex portions to receive light can be observed. Further, it is characterized in that the light source portion is formed in two, and the snail is illuminated from the front and the rear of the direction of rotation of the screw in the region, and the light source portion is characterized by no radiation wavelength. [Effect of the invention] In the inspection device for the thread peak, since the reflection sensor from the surface of the screw is placed only when the unevenness is formed, and the imaging sensor is disposed, it is possible to reliably detect the formation of the screw and further to emit different wavelengths by the arrangement. The two light sources of light can more accurately grasp the shape of the concavities and convexities like the shading or color rendering characteristics of the image. [Embodiment] FIG. 1 is a view showing the flaw of the thread peak inspection device of the present invention. The screw that is to be inspected is attached to the holding table 1 by the rotating portion 1 a, and is rotated in the direction shown in the figure, that is, the direction in which the female screw is screwed. The light source 2 (2a, 2b) illuminates the outer surface of the screw through the diffusion plate 3 (3a, 3b). The presence of the diffuser 3 (3a, 3b) illuminates the length of the male screw. Furthermore, the length of the male screw is, for example, about 2 to 3 m. The lens, the image sensor, and the image processing unit which will be described later are omitted. The shape of the peak is such that there is no light and the peak of the aforementioned region is present. with. Thread peak light position Bump. According to the photographing structure portion la. Rotating in the emitted light by expanding to the entire area, Fig. 1 is a -8-201128163. Fig. 2 is a view showing the state of the inspection apparatus shown in the figure from above. The light source 2a and the light source 2b, the diffusing plate 33, and the diffusing plate 3b are connected to each other by a screw, a lens 4, and a virtual line A of the image sensor 4, and are arranged in line symmetry. The light L 1 a and the light L 2 a radiated from the diffusing plate 3 a are reflected on the outer surface of the screw and enter the imaging sensor 5 via the lens 4. Similarly, the light Llb and the light L2b radiated from the diffusing plate 3b are reflected on the outer surface of the screw, and the input information of the imaging sensor 5 is incident on the imaging sensor 5 via the lens 4, and is transmitted to the image processing unit 6. The image processing unit 6 can recognize the shape of the entire circumferential surface of the screw based on the light information from the image sensor 4 and the rotation information from the holding table 1. Further, the image sensor 5 uses an area sensor having an area corresponding to the size of the screw. The lens 4 extracts the reflected light from the region a of the outer surface of the screw in the emitted light of the light source 2a and the reflected light from the region b of the outer surface of the screw in the emitted light of the light source 2b. The emitted light of the light source 2 (2a' 2b ) also illuminates the outer surface area of the screw (e.g., 'region c) outside the aforementioned region (region a, region b) through the diffusion plate 3 (3a, 3b)'. However, the relationship of the illumination light due to the angle of incidence is not captured by the lens 4. Therefore, if the shape of the thread peak is normal, only the screw shapes of the aforementioned areas a and b will be received by the image sensor 5. Fig. 3 is a view for explaining the light path between the light source and the lens when the shape of the thread peak is normal. Further, the peaks and valleys of the screws are continuously formed in the vertical direction of the paper. However, in order to reveal the state in which the screws are cross-cut, the shape of the thread peaks is not shown. In the figure, 'the emitted light of the light source 2a' and the position p aa of the outer surface of the screw is irradiated by the light li a of the diffusing plate 3a, and the light L2a is irradiated with the position -9 * 201128163 of the outer surface of the screw. The reflected light of the area (area a) is captured by the lens 4. Similarly, the light emitted from the light source 2b, and the light Pb passing through the diffusing plate 3b illuminates the reflected light of the region (region b) formed between the position P1b of the outer surface of the screw and the position P2b of the outer surface of the screw irradiated with the light L2b. Also taken by the lens 4. On the other hand, for example, when the light L3a is irradiated away from the region (region c) of the region a, the reflected light is not captured by the lens 4. Therefore, the image sensor omitted from the illustration recognizes the reflected light from the area a and the reflected light from the area b with respect to the rotating screw, but does not recognize the reflected light of the area c. Further, regarding the longitudinal direction of the screw (the direction in which the screw travels when the screw is rotated), all the regions of the thread peak can be simultaneously illuminated by the diffusion plate 3 (3a, 3b). Therefore, when at least one of the screws is rotated, the image processing unit 6 can grip the entire shape of the peak portion of the thread. Fig. 4 is a view showing the light path between the light source and the lens when the shape of the thread peak is abnormal and the portion has undesired irregularities. Similarly to Fig. 3, the reflected light of the area a and the reflected light of the area b are extracted by the lens 4 and received by the imaging sensor 5. On the other hand, the light L3a on the light source 2a side is reflected in the region c on the uneven wall surface H1, and the reflected light is also captured by the lens 4. Further, the light L3b on the light source 2b side is reflected on the wall surface H2 of the unevenness in the region c, and the reflected light is also captured by the lens 4. That is, if the shape of the thread peak is normal, the reflected light of the region c is not picked up by the lens 4 due to the incident angle of the illumination light, but if there is an undesired unevenness in the thread peak, the concave and convex The reflected light from the wall is captured by the lens 4. This is a feature of the invention. Further, in the present invention, the convex wall surface HI of the concave -10-201128163 can be irradiated by the light emitted from the light source 2a, and the concave and convex wall surface H2 can be irradiated by the light emitted from the light source 2b. By arranging the two light sources in the opposite directions centering on the inspection object, the reflected light of the wall surface Η 1 and the wall surface H2 can be detected at the same time, and as a result, the uneven shape can be detected more accurately. As further explained, since the screw is rotating, although any irregularity can be recognized by the reflected light when the unevenness is located in the area a or the area b, since it is illumination from one direction of the unevenness, as shown in FIG. As illustrated, the embossing is not correctly recognized. FIG. 5 discloses the light-receiving state caused by the imaging sensor 5 (area sensor). Reveal the state of a moment of the screw being rotated. (a) reveals a situation in which the shape of the thread peak is normal in accordance with Fig. 3, and (b) reveals a condition corresponding to Fig. 4, and an undesired unevenness is formed in a portion of the thread peak. In (a), the imaging sensor 5 receives the reflected light from the area a of the light source 2a and the reflected light according to the area b of the light source 2b, but the reflected light from the area c is not received. For this reason, the area corresponding to the area c does not recognize any portrait. On the other hand, in (b), the imaging sensor 5 receives the reflected light according to the area a of the light source 2a and the reflected light according to the area b of the light source 2b, and receives light as in (a), but even in The area c also receives the reflected light from the wall surface of the unevenness. As described above, according to the present invention, the image sensor 5 is originally used to receive light to detect reflected light from the region, and the unevenness of the thread peak can be detected. The light source 2 is a person who emits visible light, and for example, an LED can be used. Further, in Fig. 1 and Fig. 2, it is preferable that the light source 2a and the light source 2b emit light of different wavelengths (light of different colors). For example, for example, the light source 2a uses an LED that emits red light -11 - 201128163, and the light source 2b uses an LED that emits blue light. This advantage is because the image can be detected by using the difference between the wall surface reflected by the light of one light source and the wall surface reflected by the light of the other light source for one unevenness, and the image can be detected more specifically. The appearance of the shape. For example, in the case of Fig. 5 (b), when the red image G 1 and the blue image G2 are recognized, the combination of red and blue is a concavity and convexity, and the difference between the red and the blue is also possible. Further, it can be judged that the portion connected by the envelope of the image is the size of the unevenness. Further, it is also possible to distinguish from the unevenness which is generated close to it. However, if the light source 2a is the same as the light source 2b, the portrait G1 and the portrait G2 are recognized as the same pattern, and the image G3 existing in the vicinity thereof is also recognized, and it is difficult to specify which image is combined by the specific image. Thus, the invention also features illumination of different wavelengths of light (light of different colors) from opposite directions, respectively. The camera sensor is preferably a CCD camera that can take a color portrait. Also, the distance and focus from the thread peak can be adjusted by adjusting the lens. Further, in the above embodiment, the image sensor has been described using the area sensor, but it may be used as a line sensor. In this case, the same effect can be exhibited by using the line sensor only by using the area c as the light receiving area. The diffusion plate 3 is made of, for example, an acrylic plate or the like. Illumination from all directions can be performed by diffusing the illumination light to the screw. Thereby, unevenness can be detected with higher precision. In the foregoing embodiment, the case where the light source 2 and the diffusing plate 3 are fixed and the entire length of the screw can be simultaneously illuminated will be described. However, for example, in the case where the full length of the screw is longer, it may be The light source 2 and the diffuser plate 3 are moved in the entire length direction of the screw, and the outer surface of the screw is illuminated with the movement. Further, the above-mentioned Figs. 1, 2, 3, and 4 are expressed in an extremely simplified manner in order to explain the convenience of the invention. For this reason, the angles and directions of the incident angle, the reflection angle, and the like are not necessarily optically described correctly. Further, the screw only shows the portion of the thread peak and the valley. However, the head and the body of the screw actually exist. BRIEF DESCRIPTION OF THE DRAWINGS [Fig. 1] A schematic configuration of an inspection apparatus relating to a thread peak of the present invention is disclosed. [Fig. 2] A schematic structure of an inspection method for a thread peak of the present invention is disclosed. [Fig. 3] A schematic structure of an inspection method for a thread peak of the present invention is disclosed. [Fig. 4] A schematic structure of an inspection method for a thread peak of the present invention is disclosed. Fig. 5 is a view showing a concept for explaining an inspection apparatus relating to a thread peak of the present invention. Fig. 6 is a view showing an inspection apparatus for explaining a previous thread peak. [Main component symbol description] 1 : Hold station 2 : Light source -13- 201128163 3 : Diffuser 4 : Lens 5 : Camera sensor 6 : Image processing unit -14 -