本論文是探討物體厚薄程度如何影響人的抓取時間以及採行的抓取策略，時間的物體為直徑44mm大小的圓形薄片體，其厚度分別為1, 2.6, 3.1, 3.9, 5.3, 8.2及20.0 mm的七種厚度水準。共有15位男性及15女性大學生參與這個研究，其實驗工作是將放置在平面上的薄片，以輕鬆方式進行抓取動作並量測抓取的時間，且每個物體隨機重複抓取六次。抓取時間訂為由手開始接觸到薄片體的瞬間始至薄片體完全離開平面的瞬間止。且抓取策略歸納為三種策略方式，分別為手部接觸策略、手部抓取主控策略及手部完成抓取策略三種。手部接觸策略有食指拖曳、拇指拖曳、食指固定、拇指固定及同時接觸等方法；手部抓取主控策略有食指主控、中指主控、無名指主控、食中指主控、中無名指主控、拇指主控及共同控制等方法；手部完成抓取策略有食指夾取、中指夾取、輔助夾取、三角夾取、中無名指、四指並用以及五指全用法等方法，並從中歸納出較佳之策略方式。
經由上述之步驟經過初步預試與正式實驗之後，得到以下重點結論給予產品設計領域中的設計者或相關人員應用與參考：1.研究結果顯示抓取時間與厚度的關係成反對數的關係，歸納公式：{ ；0 <厚度≦ 20}，當厚度小於約3.1mm時，抓取時間會向上驟升表越形困難；而厚度大於約5.3mm之後，時間差異越小表達容易抓取的狀態。2.對於平面上薄片體，男性抓取能力績效與女性無顯著差異。3.在抓取策略上，面對不同厚薄程度的薄片體則以同時夾取接觸方式 (S) 與共同抓取掌控法 (Bf) 以及中無名指模式 (Mrg)；或同時夾取接觸方式(S) 與共同抓取掌控法 (Bf) 以及輔助夾取模式 (Sg) 為較佳之抓取策略。4.人在主觀判斷上對在平薄物體的些微厚薄改變無法明顯的區分，只對較顯著的厚薄度變化有明顯的區分能力。5.就實驗結果而言，男性與女性在物體的厚薄主觀判斷上差異不大。

關鍵字：抓取、抓取能力、抓取策略、產品設計

The purpose of this thesis is to study the influence of the thickness of flat objects on people’s grip ability, by means of the measurement of the grip’s performance time. Observing how people grip the given flat objects, I want to come up with the better strategies in terms of the thickness of the gripped objects. In order to accomplish the above objective, I compose a series of questionnaires for the tested people, which compares differences before and after the test. On the basis of the result of my experiment, I attempt to provide some guidelines for people in terms of their subjective and objective difference.
The range of my research object is confined to the diametrically 44 mm-sized round objects. There are thirty normal participants, each of whom is given seven object’s levels tested for six times in a random order. This experiment totally amounts to 1260 data, which are recorded by Digital Video in terms of every motion of people’s grip, and succeeded with an analysis related to people’s grip ability.
I reach some conclusions that follow (and that may be taken as references for the designers of product design and people related): 1. The formula of People’s grip ability and flat object’s thickness is { ;0<thickness≦20}. People’s grip ability gets even weaker when the thickness of the object is below 3.1 mm; however, it gives more access for people’s ability to grip when the thickness of the flat object is above 5.3 mm. 2. Male’s grip ability is no difference with Female’s in terms of flat object on plane. 3. When given various flat objects, the following two strategies are recommended: a. Simultaneous (S), Both finger force (Bf) and Middle-ring finger grip (Mrg); b. Simultaneous (S), Both finger force (Bf) and Supported grip (Sg). 4. One can subjectively tell the difference of the thickness of the flat objects only when the difference is significant. 5. There is no significant deference between male and female in subjective judgment on the thickness of flat objects.

Keywords: Grip, Grip ability, Grip strategy, Product design

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